---
product_id: 412551126
title: "- KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids"
brand: "komestone"
price: "$226.65"
currency: USD
in_stock: true
reviews_count: 13
category: "Kome Stone"
url: https://www.desertcart.us/products/412551126-komestone-rock-tumbler-kit-k1-professional-large-2-5lb-capacity
store_origin: US
region: United States of America
---

# 75% quieter operation 2.5 lb large capacity barrel 9-day digital timer - KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids

**Brand:** komestone
**Price:** $226.65
**Availability:** ✅ In Stock

## Summary

> 💎 Turn rough stones into dazzling gems — your new obsession starts here!

## Quick Answers

- **What is this?** - KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids by komestone
- **How much does it cost?** $226.65 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/412551126-komestone-rock-tumbler-kit-k1-professional-large-2-5lb-capacity)

## Best For

- komestone enthusiasts

## Why This Product

- Trusted komestone brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-Inclusive Pro Kit:** Comes with everything you need—rocks, 4-stage polishing grits, ceramic media, extra belts, and a full-color guidebook to master museum-quality shine.
- • **Whisper-Quiet Rock Spa:** Experience near-silent polishing with a thickened soft rubber barrel that reduces noise by 75%, perfect for home, classroom, or office.
- • **Precision Timing & Control:** Customize your tumbling with a 9-day digital timer, 3 variable speeds, and pause/resume memory function for flawless results every cycle.
- • **Massive Capacity for More Gems:** Polish 2.5 times more stones per batch than standard tumblers, accelerating your creative projects and family fun.
- • **Certified Safe & Family Friendly:** CPC-certified non-toxic materials and smooth, secure design make it the ultimate STEM gift for curious kids and adults alike.

## Overview

The KomeStone K1 Professional Rock Tumbler Kit features a large 2.5 lb capacity soft rubber barrel for quieter operation, a digital 9-day timer with variable speeds and memory function, and a 4-stage polishing system with included grits and ceramic media. Certified non-toxic and family safe, it’s designed for both beginners and hobbyists to create museum-quality polished stones with ease. Backed by a 90-day satisfaction guarantee and 1-year warranty, this all-in-one kit is perfect for STEM education, creative crafts, and gifting.

## Description

Product description Trusted Choice in Rock Tumbling — Recognized for Quality & Performance Are you tired of compromising between function and capacity when it comes to rock tumbling? Look no further. The KomeStone K1 Classic Edition has been widely recognized for its balance of performance, durability, and user-friendly design — making it a trusted choice for enthusiasts, hobbyists, and families across the U.S. Our tumbler’s quality and reliability have also been highlighted by independent product evaluators , who acknowledge its strong feature set and long-term value. This recognition reinforces what our customers already know: K1 delivers results that truly stand out in real-world use. We understand that rock tumbling is more than a hobby — it’s an investment. That’s why we support every tumbler with lifelong assistance, including replacement parts and technical guidance. Even after your warran*ty expires, we’re still here to help you keep your machine running smoothly for years ahead. Your trust means everything to us. We aren’t just here to sell — we’re here to support. Always. Bring Every Stone to Life — Your Next Discovery Awaits Each stone hides a story waiting to be revealed. The moment when rough rocks turn smooth and begin to shine is pure magic — a reward for your patience, curiosity, and creativity. Watching your collection come to life is not just satisfying — it’s inspiring. Rock tumbling isn’t just about polishing stones — it’s about the process of discovery. Many families tell us it has become a shared hobby that helps children build focus, patience, and an appreciation for hands-on learning. Every polished gem becomes a reminder that beautiful things take time and care. To keep your adventure going, explore our refill grit sets — available in 4 lb, 6 lb (with ceramic media), and 10 lb (with ceramic & plastic pellets) — perfect for larger projects or long-term tumbling. And for that final, glassy brilliance, try our 8000 / 12000 grit aluminum oxide polish in your next batch. Thank you for your contribution! Notice: If there is any part missing, please kind take a moment to reach out for a replacement or the compensation. Thanks for your patience! Welcome to a world of exquisite craftsmanship! Share your captivating stone creations with us, and we'll proudly showcase them across our desertcart details page and vibrant social media platforms. Your talent deserves a spotlight. Should any concerns arise, rest assured, we're dedicated to swift solutions. Instead of frustration, kindly connect with us for assistance. Our support is unwavering. You may not know: Rock tumblers transform raw rocks into stunning gems for jewelry, crafting, and collections. For an exceptional shine, explore the art of polishing with high-quality grits, soap water, mineral oil, and meticulous steps. Practice perfects the process. Dig Deeper Is operating the rock tumbler effortless? Absolutely. Inside your package, discover a full-color Instruction book, guiding you through every step. It's so clear, even a 4-year-old can navigate it. Will the belts break? Currently, all of our rock tumblers come with PU belts, which is a new and upgraded, more durable option. Generally, these belts do not break, although special circumstances may occur. However, if the belt breaks, please replace it with one of the PU belt from the pack. After placing your order or receiving the product,please email to our after-sales service center to receive the additional 5 spare belts. You can find the specific after-sales email on the main image or in the manual. Rest assured, for any products issues, please reach out to us, and we will handle them properly. We are in the process of replacing all belts with PU belts, meaning that future belts are unlikely to break. Encountering a hiccup with your rock tumbler? First, consult our FAQs in the instruction book or on this page. For product concerns, connect with us directly. Our dedication to unparalleled service ensures swift resolutions. Ensure you include the polishing grits kit in your cart alongside this rock tumbler – together, they create the ideal combination for an impeccable finish． Your satisfaction is paramount. Trust that we're dedicated to elevating your experience and swiftly addressing every matter.

Review: Great for tumbling small parts and hardware - I end up with a lot of old hardware and small bits and pieces that come from garage sales, cannibalized equipment, etc. I also restore old tools, work on old cars and motorcycles, etc. I wanted a small tumbler so that I could drop a handful of fasteners or small parts in, let it run for a while, and come back to clean metal. This was a complete shot in the dark. I usually soak parts in vinegar or phosphoric acid when they're rusty, and that works well enough that I wasn't sure if tumbling would work better or be less hassle. On the one hand, there's no acid to neutralize and not much pre-cleaning that has to be done. On the other, you have to deal with abrasive grit, which can get everywhere (and I mean EVERYWHERE). Since I didn't know if I'd like this approach, I didn't want to risk a lot of money on a tumbler. I bought this kit because it was inexpensive and had decent reviews. If this ended up being an essential part of my workflow, I decided that I could always buy something bigger and/or better in the future. So far, this tumbler has been awesome. The first batch of parts that I threw in was a rusty mess of hardware that I'd picked up at a garage sale. This stuff probably hadn't seen the light of day in decades and had a pretty solid layer of rust on it. I skipped the included media and instead filled the tumbler drum with medium (70 grit) aluminum oxide, which is a pretty aggressive grit used for media blasting. I'm not a fan of membrane buttons or plastic construction on most things because I haven't found it to be particularly durable, and this tumbler has both. It certainly doesn't look heavy duty and I didn't expect much out of it. In reality, I didn't even think it would have the power to turn a drum that was chock-full of steel hardware and abrasive, but I gave it a shot. I was pleasantly surprised that the drum started turning effortlessly even at the highest speed. Most of the hardware had settled to one side so the load was imbalanced and the tumbler started to walk across my workbench, but I propped it in place with a heavy box and let it run. After about an hour I checked on the hardware and almost all the rust was gone. I dumped the contents of the drum through a strainer, which made separating the hardware a breeze. What was left was almost completely clean steel, certainly clean enough to use once I blew the last of the grit away with an air hose. I ran a few more handfuls of hardware through this machine with the same results. I also ran a really cheap set of rusty no-name sockets that I bought at (yet another) yard sale. I keep junk sockets around in case I need to modify them for odd sizes or special uses, and these followed me home to be added to the "just in case" pile. The sockets came out fairly clean. The chrome plating is peeling off and while the tumbler knocked off any rust and loose bits of plating, it didn't take everything down to bare metal. That's fine, however, because it did most of the dirty work for me while I was doing something else. I can always give one of these sacrificial sockets a once-over on the wire wheel if I need to weld or modify it, but at least I'm starting with something relatively clean and rust-free. If you tumble steel parts or hardware, just remember that what comes out will be prone to re-rusting pretty quickly. This is because you've abraded off any protective oxide layers that were on the metal. It's a good idea to blow off any remaining media and then oil the metal to protect it. Also be aware that touching the raw metal with bare skin can cause it to rust faster, as the salts and acids in your perspiration all cause oxidation. I usually wear nitrile gloves in the garage so this isn't much of a problem for me. When I pulled this dainty little thing out of the box, I figured it would be good for a couple of uses at best before the motor burned out or something broke. So far I'm pleasantly surprised. It's put in a few hours of work with no complaint and nothing broken, and it does a good job of removing light to moderate rust. The aluminum oxide is a worthwhile investment (I think I paid $20 for 25 pounds or so, and I could've gotten a way better deal if I'd shopped around). Long term durability is still a question of course so we'll see how that goes, but so far this thing punches above its weight.
Review: Great Tumbler!! - So far, this has been a really great tumbler and runs perfectly. I like the timers and speed settings. The tumbler is as quiet as a rock tumbler can be, which if you've ever had one, you know they do make some noise. The company sent extra belts free of charge, instructions for how to get the extra belts included in the kit! The instructions were good and the tumbler is easier to open than my older tumbler as the barrel is soft and bendable. No leaks and handles 3/4 full load of rocks and grit with no problem. I'm through with my 2nd round and the tumbled rocks look good so far. I did not use the rocks that came with the tumbler as I have a bunch of my own already but there was a good selection included with this tumbler. I'm also not using the grit that came with the tumbler as I use a higher grade purchased from another company that has aluminum oxide 500 for the 3rd step rather than silicon carbide that's included with this tumbler. Overall, I'd recommend this tumbler as a good starter tumbler for adults or children interested in the wonderful world of rock tumbling!

## Features

- RANKED #1 BY LEADING REVIEWERS — TRUSTED BY THOUSANDS OF FAMILIES: The KomeStone K1 Rock Tumbler was ranked the #1 Rock Tumbler by top independent product reviewers, recognized for performance, safety, and value. This gives parents confidence during holiday gift shopping, especially for STEM-minded kids and family creators.
- 𝟗𝟎-𝐃𝐚𝐲 𝐒𝐚𝐭𝐢𝐬𝐟𝐚𝐜𝐭𝐢𝐨𝐧 𝐆𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞 & 𝟏-𝐘𝐞𝐚𝐫 𝐖𝐚𝐫𝐫𝐚𝐧𝐭𝐲: Enjoy peace of mind with our extended 90-day refund guarantee and 1-year warranty. If you miss desertcart’s 30-day return window, simply contact our US-based customer service for hassle-free replacement or refund assistance. We provide 24/7 claim support to ensure a smooth rock tumbling experience and complete customer satisfaction.
- SAFE FOR KIDS – CERTIFIED NON-TOXIC AND FAMILY FRIENDLY: KomeStone rock tumblers enjoys the CPC certification (Children's Product Certificate) issued by the federal government, and made from non-toxic, child-safe materials, ensuring a fun and educational STEM learning experience parents can trust. Smooth edges, secure closures, and low-noise operation make it a safe and engaging rock tumbler gift for curious young explorers.
- DIVE INTO THE FUN ROCK TUMBLING: KomeStone rock tumbler turns rough rocks into smooth gemstones through a real 4-stage tumbling process. Kids love watching each cycle’s transformation—a great patience lesson—and adults enjoy using polished stones for jewelry making and DIY crafts.
- 2025 NEW UPGRADE & ADVANCED FEATURES: Elevate your tumbling with a built-in LCD screen, 9-day timer, 3-speed controls, and pause/resume function. The thickened rubber barrel increases durability and improves noise reduction, while our custom polishing recipes help produce brighter, professional-level gemstones.
- 2.5 LB EXTRA LARGE CAPACITY & QUIETER: Our 100% soft rubber barrel absorbs impact for 75% quieter operation (similar to a dishwasher). The large-capacity design polishes 2.5× more rocks than standard 1 lb barrels—ideal for families, classrooms, and serious rock tumbling hobbyists.
- COMES WITH EVERYTHING YOU NEED: Includes tumbler, rubber barrel, 1 lb rough rocks, extra belts, 4 polishing grits, ceramic media, and an easy full-color guidebook—simple enough for any starter rock tumbler user to begin tumbling independently.
- SCIENCE-BACKED POLISHING FOR PRO-LEVEL RESULTS: Achieve museum-quality shine through our 4-stage grit system (60/120/150/1200) and precision ceramic media. The leak-proof stainless-steel lid ensures a clean, mess-free tumbling cycle, and our exclusive guidebook teaches pro polishing techniques for advanced users.
- About KomeStone: KomeStone rock tumblers are the first with brushless motor technology and now lead U.S. sales by a wide margin. We are more than a manufacturer — we’re your partner, offering reliable products and lifetime support you can count on.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09PYR2RRT |
| Age Range Description | 13 years and up |
| Best Sellers Rank | #12,349 in Toys & Games ( See Top 100 in Toys & Games ) #3 in Kids' Rock Tumblers |
| Brand Name | KomeStone |
| Color | Black |
| Customer Reviews | 4.5 out of 5 stars 3,017 Reviews |
| Educational Objective | Teaching geology, creative design, patience |
| Included Components | 1 pound of rocks & 4 bages of polishing grits & ceramic pellets, 1 rock tumbler base & 1 rubber barrel, 2 PU belts & user instructions, jewelry fastenings & adaptor & screwdriver & mesh strainer |
| Indoor Outdoor Usage | Indoor |
| Is Assembly Required | No |
| Item Dimensions | 11.22 x 9.02 x 5.71 inches |
| Manufacturer | KomeStone |
| Manufacturer Maximum Age (MONTHS) | 1200.0 |
| Manufacturer Minimum Age (MONTHS) | 156.0 |
| Manufacturer Part Number | CA-KS0107RT17 |
| Material Type | Japanese carbon motor, Rubber, Stainless Steel, 𝐂𝐏𝐒𝐈𝐀 & 𝐂𝐏𝐂 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 |
| Model Number | K1 |
| Number of Players | 1 |
| Operation Mode | Manual |
| Power Source | AC adapter |
| Set Name | KomeStone K1 Professional Large 2.5LB Capacity Edition |
| Size | Large |
| Supported Battery Types | No batteries required |
| Theme | Lapidary Tool for DIY Jewelry & Crafts, Perfect gift choice for the families or friends, Rock Tumbler Kit for Polishing Stones, Rock Tumbler Starter Kit with Timer & Motor, Rock Tumbler with Grits and Accessories, Stone Polishing Machine for Kids & Adults |
| Unit Count | 1.0 Count |

## Images

![- KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids - Image 1](https://m.media-amazon.com/images/I/81XC2xdthkL.jpg)
![- KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids - Image 2](https://m.media-amazon.com/images/I/81OJk6vKH4L.jpg)
![- KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids - Image 3](https://m.media-amazon.com/images/I/81YTT2-S2rL.jpg)
![- KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids - Image 4](https://m.media-amazon.com/images/I/71M-qkCBzVL.jpg)
![- KomeStone Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Includes All Accessories, Rock Polisher Gift for Adults & Kids - Image 5](https://m.media-amazon.com/images/I/71Q6mMAz0sL.jpg)

## Questions & Answers

**Q: Replacement belts. How do I order?**
A: Hi, here is the link for the belts: 
https://www.amazon.com/dp/B09S67HKV5/

Or just search KomeStone rock tumbler belts at amazon.com, then you'll find the belts. 

You are also welcome to follow our brand store on amazon.com through this link: https://www.amazon.com/stores/RockTumblerKit/page/98CD222F-C7A7-4372-80AE-0F0370A463C5
you'll find all accessaries related to our rock tumbelrs. 
If you want to contact our customer service, just email us via: support@komestone.com, we'll get back to you very soon!

**Q: Will the starter kit include all 9 kinds of stones or are there just some random rocks?**
A: This rock tumbler kit includs 9 kinds of stones as advertised,  weights around 1lb.

**Q: Can I tumble rocks we find at the park or do they have to be these special rocks?**
A: You can tumble any rocks you’d like, I suggest you get a rock identification app, plus a hardness chart. The rocks you tumble need to be the same hardness or the softer rocks will disappear… this is a lot of fun and the outcome is beautiful

**Q: Can this tumbler be used to polish metal washers?**
A: Based on two factors, yes it can.
#1 The washer must be a metal that could be polished in a conventional method, such as a buffing machine.
#2 That you are using a powder made for polishing.
I will add that I do not recommend polishing metal items in a tumbler,

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great for tumbling small parts and hardware
*by Z***L on October 27, 2025*

I end up with a lot of old hardware and small bits and pieces that come from garage sales, cannibalized equipment, etc. I also restore old tools, work on old cars and motorcycles, etc. I wanted a small tumbler so that I could drop a handful of fasteners or small parts in, let it run for a while, and come back to clean metal. This was a complete shot in the dark. I usually soak parts in vinegar or phosphoric acid when they're rusty, and that works well enough that I wasn't sure if tumbling would work better or be less hassle. On the one hand, there's no acid to neutralize and not much pre-cleaning that has to be done. On the other, you have to deal with abrasive grit, which can get everywhere (and I mean EVERYWHERE). Since I didn't know if I'd like this approach, I didn't want to risk a lot of money on a tumbler. I bought this kit because it was inexpensive and had decent reviews. If this ended up being an essential part of my workflow, I decided that I could always buy something bigger and/or better in the future. So far, this tumbler has been awesome. The first batch of parts that I threw in was a rusty mess of hardware that I'd picked up at a garage sale. This stuff probably hadn't seen the light of day in decades and had a pretty solid layer of rust on it. I skipped the included media and instead filled the tumbler drum with medium (70 grit) aluminum oxide, which is a pretty aggressive grit used for media blasting. I'm not a fan of membrane buttons or plastic construction on most things because I haven't found it to be particularly durable, and this tumbler has both. It certainly doesn't look heavy duty and I didn't expect much out of it. In reality, I didn't even think it would have the power to turn a drum that was chock-full of steel hardware and abrasive, but I gave it a shot. I was pleasantly surprised that the drum started turning effortlessly even at the highest speed. Most of the hardware had settled to one side so the load was imbalanced and the tumbler started to walk across my workbench, but I propped it in place with a heavy box and let it run. After about an hour I checked on the hardware and almost all the rust was gone. I dumped the contents of the drum through a strainer, which made separating the hardware a breeze. What was left was almost completely clean steel, certainly clean enough to use once I blew the last of the grit away with an air hose. I ran a few more handfuls of hardware through this machine with the same results. I also ran a really cheap set of rusty no-name sockets that I bought at (yet another) yard sale. I keep junk sockets around in case I need to modify them for odd sizes or special uses, and these followed me home to be added to the "just in case" pile. The sockets came out fairly clean. The chrome plating is peeling off and while the tumbler knocked off any rust and loose bits of plating, it didn't take everything down to bare metal. That's fine, however, because it did most of the dirty work for me while I was doing something else. I can always give one of these sacrificial sockets a once-over on the wire wheel if I need to weld or modify it, but at least I'm starting with something relatively clean and rust-free. If you tumble steel parts or hardware, just remember that what comes out will be prone to re-rusting pretty quickly. This is because you've abraded off any protective oxide layers that were on the metal. It's a good idea to blow off any remaining media and then oil the metal to protect it. Also be aware that touching the raw metal with bare skin can cause it to rust faster, as the salts and acids in your perspiration all cause oxidation. I usually wear nitrile gloves in the garage so this isn't much of a problem for me. When I pulled this dainty little thing out of the box, I figured it would be good for a couple of uses at best before the motor burned out or something broke. So far I'm pleasantly surprised. It's put in a few hours of work with no complaint and nothing broken, and it does a good job of removing light to moderate rust. The aluminum oxide is a worthwhile investment (I think I paid $20 for 25 pounds or so, and I could've gotten a way better deal if I'd shopped around). Long term durability is still a question of course so we'll see how that goes, but so far this thing punches above its weight.

### ⭐⭐⭐⭐⭐ Great Tumbler!!
*by S***N on February 3, 2025*

So far, this has been a really great tumbler and runs perfectly. I like the timers and speed settings. The tumbler is as quiet as a rock tumbler can be, which if you've ever had one, you know they do make some noise. The company sent extra belts free of charge, instructions for how to get the extra belts included in the kit! The instructions were good and the tumbler is easier to open than my older tumbler as the barrel is soft and bendable. No leaks and handles 3/4 full load of rocks and grit with no problem. I'm through with my 2nd round and the tumbled rocks look good so far. I did not use the rocks that came with the tumbler as I have a bunch of my own already but there was a good selection included with this tumbler. I'm also not using the grit that came with the tumbler as I use a higher grade purchased from another company that has aluminum oxide 500 for the 3rd step rather than silicon carbide that's included with this tumbler. Overall, I'd recommend this tumbler as a good starter tumbler for adults or children interested in the wonderful world of rock tumbling!

### ⭐⭐⭐⭐⭐ So much fun!
*by A***Y on April 30, 2026*

This is a great little rock tumbler! I have run quite a few batches through this thing and it's always fun to see the shiny results after the last grit. So far it works as it should for me with no issues!

## Frequently Bought Together

- Rock Tumbler Kit, K1 Professional Large 2.5LB Capacity Edition - Memory Function, Digital Timer & Variable Speeds: Create Stunning Gems Full Accessories Included
- Rock Tumbler Polishing Grits and Ceramic Tumbling Media Kit | Essential for Polishing, 4 Steps Rock Tumbling Refill Media, Polish up to 25 lbs of Rocks, Work with Any Rock Tumblers, for More Tumbles

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-16*