---
product_id: 456405375
title: "C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function"
brand: "koolstone"
price: "$276.24"
currency: USD
in_stock: true
reviews_count: 5
category: "Kool Stone"
url: https://www.desertcart.us/products/456405375-c1-rock-tumbler-kit-professional-large-2-5lb-capacity-up
store_origin: US
region: United States of America
---

# 75% noise reduction 2.5LB large capacity 9-day timer with memory C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function

**Brand:** koolstone
**Price:** $276.24
**Availability:** ✅ In Stock

## Summary

> 🪨 Transform Rough Rocks into Polished Gems—Quietly, Quickly, Confidently!

## Quick Answers

- **What is this?** C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function by koolstone
- **How much does it cost?** $276.24 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/456405375-c1-rock-tumbler-kit-professional-large-2-5lb-capacity-up)

## Best For

- koolstone enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Replaceable durable drive belt extends tumbler lifespan
- • **Quiet Powerhouse:** Rubber barrel reduces noise by 75%—perfect for home or classroom
- • **All-Inclusive Kit:** Includes rocks, grits, media, jewelry fastenings & tutorial guide
- • **Polish More, Wait Less:** 3-speed controls & 9-day auto shutoff for precision tumbling
- • **Confidence in Every Cycle:** Backed by 1-year warranty & 90-day risk-free trial

## Overview

The KoolStone C1 Rock Tumbler Kit offers a professional-grade 2.5LB capacity with 75% noise reduction thanks to its rubber barrel. Featuring 3 adjustable speeds, a 9-day timer with memory and automatic shutoff, it delivers faster, precise polishing results. The all-in-one kit includes assorted rough stones, polishing grits, ceramic media, jewelry fastenings, and a detailed guide—perfect for hobbyists and families. Durable and easy to maintain with a replaceable drive belt, it’s backed by a 1-year warranty and 90-day money-back guarantee for worry-free tumbling.

## Description

This large 2.5LB capacity tumbler, 75% quieter than most plastic barrels, comes with a 1-year warranty for your peace of mind. The kit includes a rock tumbler base, a rubber barrel, 1LB of assorted rough rocks, 6 belts for spare use, 4 bags of polishing grits, a bottle of ceramic tumbling media, a power adapter, jewelry fastenings, a mesh strainer, and an illustrated learning booklet. The 3-speed controls and 9-day timer with automatic shutoff and memory function ensure faster polishing time and better polishing results.

Review: I bought this to tumble some seaglass that I had collected that just wasn't quite tumbled enough. The kit comes with a set of rocks and 1 pack each of 4 different grades of grit from Corse to very fine. They include an extra belt, stuff to make jewelry, great instructions and a card to email for additional rocks. It's very quiet, sturdy easy to use and good quality. I did email for extra rocks and it was great customer service. I mentioned that I didn't get the extra belt when I communicated with Daisy for the additional rocks. She was very helpful and professional and said that she'd make sure I got a belt with my rocks. Within a week I had my product and she followed up to ensure I had received it. Awesome all round.
Review: Great product. Works well, tumbles relatively quietly in the rubber drum. Easy to load/unload rocks for the various stages. Easy to set up the duration in days and speed required. Excellent instruction manual. Would recommend to buy for anyone interested in seeing the beauty hidden away in some fairly common rocks..

## Features

- KoolStone C1 Series – Trusted by Beginners, Backed by Experts. Start your rock tumbling journey with KoolStone, the brand trusted by thousands of families and hobbyists. The C1 Rock Tumbler is a classic model that balances reliable performance with all-in-one convenience. From the classic C1 to the Pro, Pro Max, and Pro Ultra, KoolStone continues to evolve with exclusive designs and upgraded performance for every rock enthusiast — ready to start your rock tumbling journey.
- START A TUMBLING JOURNEY -- C1 Rock Tumbler turn rough rocks into polished gems, then you will be very excited to see the stones change with each cycle. That's a fun process of rock tumbling and a family little project for parent-child endeavor.
- 2.5LB LARGE CAPACITY & 75% QUIETER -- The updated KoolStone Rock Tumbler features a large 2.5LB barrel, perfect for polishing multiple stones in one batch. Holds more rocks than most beginner tumblers. The rubber barrel is 75% quieter than typical plastic barrels, making it ideal for home or classroom use.
- FASTER POLISHING TIME & BETTER POLISHING RESULTS -- 3-speed controls (providing more granular tumbling results), a 9-day timer (with automatic shutoff feature and memory function), all displayed on clear screen, letting you easily hone your settings for precise tumbling each time. A complete polishing cycle usually takes 3–4 weeks, during which stones gradually become smoother and slightly smaller.
- EVERYTHING YOU NEED FOR TUMBLING IS HERE -- C1 Rock Tumbler has everything you need to create polished gemstones. Rock tumbler, 2.5LB capacity rubber barrel, 1LB for 9 different types of rough gemstones, 3 belts and 4 polishing grits and ceramic contact media, sifter, jewelry fastenings, and illustrated tutorial guide. For longer use and better results, pair it with KoolStone’s 4LB Professional Polishing Grit (sold separately).
- Official KoolStone Warranty – 𝟏 𝐘𝐞𝐚𝐫 𝐂𝐨𝐯𝐞𝐫𝐚𝐠𝐞 & 𝟗𝟎-𝐃𝐚𝐲 𝐑𝐢𝐬𝐤-𝐅𝐫𝐞𝐞 𝐓𝐫𝐢𝐚𝐥. Your purchase is protected by KoolStone’s official 𝟏-𝐲𝐞𝐚𝐫 𝐰𝐚𝐫𝐫𝐚𝐧𝐭𝐲 and a 𝟗𝟎-𝐝𝐚𝐲 𝐦𝐨𝐧𝐞𝐲-𝐛𝐚𝐜𝐤 𝐠𝐮𝐚𝐫𝐚𝐧𝐭𝐞𝐞. Shop with confidence — we’re here to support your tumbling journey.
- Easy Maintenance – The durable drive belt is designed to be replaceable, making maintenance simple and extending the life of your rock tumbler.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09YM33DGD |
| Age Range Description | Suitable for children aged 13 and above |
| Best Sellers Rank | #183,030 in Kitchen ( See Top 100 in Kitchen ) #2,822 in Tumblers & Water Glasses |
| Brand Name | KoolStone |
| Color | Brush Edition: C1 |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,825) |
| EU Spare Part Availability Duration | 1 Years |
| Educational Objective | STEM |
| Included Components | 1-Year Warranty Card, Illustrated Learning Booklet, 1A Power Adapter, Jewelry Fastenings, Mesh Strainer, Screwdriver, 1LB Assorted Rough Rocks, 3 Belts for Spare Use, 4 Bags of Polishing Grits, 1 Bottle Ceramic Tumbling Media, Rock Tumbler Base, 2.5LB Capacity Rubber Barrel |
| Indoor Outdoor Usage | Indoor |
| Is Assembly Required | No |
| Item Dimensions | 28.5 x 22.9 x 14.5 centimeters |
| Item Type Name | Rock Tumbler |
| Item Weight | 2.84 Kilograms |
| Manufacturer | KoolStone |
| Manufacturer Maximum Age (MONTHS) | 1188.0 |
| Manufacturer Minimum Age (MONTHS) | 48.00 |
| Manufacturer Part Number | KS20220422 |
| Material Type | metal, metal 1.）Tyre grade rubber barrel top-quality stainless steel. 2.) If you received package missing parts or damaged no worries please feel free to reach out at support@ikoolstone.com to take replacemenet. 3.) Any problems before purchasing please reach out at support@ikoolstone.com to get answer. |
| Model Number | KS20220422 |
| Number of Batteries | 1 AA batteries required. |
| Number of Players | 1 |
| Operation Mode | Automatic |
| Power Source | manual |
| Set Name | C1 Rock Tumbler Kit |
| Size | L |
| Supported Battery Types | No batteries required |
| Theme | Perfect gift for rock lovers and hobbyists to create stunning polished stones. |
| Unit Count | 1 Count |

## Images

![C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function - Image 1](https://m.media-amazon.com/images/I/81zDGxdlUJL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by M***T on 21 November 2024*

I bought this to tumble some seaglass that I had collected that just wasn't quite tumbled enough. The kit comes with a set of rocks and 1 pack each of 4 different grades of grit from Corse to very fine. They include an extra belt, stuff to make jewelry, great instructions and a card to email for additional rocks. It's very quiet, sturdy easy to use and good quality. I did email for extra rocks and it was great customer service. I mentioned that I didn't get the extra belt when I communicated with Daisy for the additional rocks. She was very helpful and professional and said that she'd make sure I got a belt with my rocks. Within a week I had my product and she followed up to ensure I had received it. Awesome all round.

### ⭐⭐⭐⭐⭐ Review
*by A***S on 30 March 2026*

Great product. Works well, tumbles relatively quietly in the rubber drum. Easy to load/unload rocks for the various stages. Easy to set up the duration in days and speed required. Excellent instruction manual. Would recommend to buy for anyone interested in seeing the beauty hidden away in some fairly common rocks..

### ⭐ Review
*by N***3 on 10 December 2025*

Worked for a month then the motor gave up, I followed all the instructions on weight. The belts are also poor quality, went through 2 In just a month.

## Frequently Bought Together

- KoolStone C1 Rock Tumbler Kit - Professional Large 2.5LB Capacity, Up to 5X More Noise Cancelling, Adjustable Timer & Speed with Full Accessories & Memory Function, Ideal for Adults Kids
- Blue Marble National Geographic Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with Any Rock Polisher, Rock Tumbler Supplies
- 5 Packs of Rock Tumbler Replacement Belts, Only Compatible with KoolStone C1, C1 Pro & C3 Rock Tumbler, 78 * 4mm

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-19*