---
product_id: 383462772
title: "Science MAD! SM42 Rock Tumbler, Multi"
brand: "science mad"
price: "$169.28"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/383462772-science-mad-sm42-rock-tumbler-multi
store_origin: US
region: United States of America
---

# 100g rough rocks 3 timer settings STEM learning focus Science MAD! SM42 Rock Tumbler, Multi

**Brand:** science mad
**Price:** $169.28
**Availability:** ✅ In Stock

## Summary

> ✨ Turn Rocks into Treasures! ✨

## Quick Answers

- **What is this?** Science MAD! SM42 Rock Tumbler, Multi by science mad
- **How much does it cost?** $169.28 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/383462772-science-mad-sm42-rock-tumbler-multi)

## Best For

- science mad enthusiasts

## Why This Product

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

## Key Features

- • **Ready to Roll:** Includes everything you need to start tumbling right away.
- • **STEM Fun for All:** Encourages scientific curiosity and imagination.
- • **Patience Pays Off:** Watch your stones shine in just 2-4 weeks!
- • **Unleash Creativity:** Transform dull stones into stunning gems!
- • **Craft Your Own Jewelry:** Create unique pieces with your polished stones.

## Overview

The Science MAD! SM42 Rock Tumbler is an engaging stone polishing machine designed for kids aged 10 and up. It comes with 100g of rough rocks, polishing powder, and accessories to create beautiful, polished stones. With three timer settings and a focus on STEM learning, this product promotes creativity and patience as children explore geology and craft their own jewelry.

## Description

SM42 Rock Tumbler, Multi

## Features

- INSPIRE YOUR CHILD’S IMAGINATION - This Science Mad Rock Tumbler is a stone polishing machine perfect for boys and girls ages 10 years plus. Reveal the hidden, natural beauty of rough gemstones. Ignite curiosity about geology and discover a fun new hobby by turning rough stones into beautiful smooth polished stones, all from the comfort of home.
- READY TO GO OUT OF THE BOX – As well as the tumbler unit you will find inside 100g each of rough rocks, agate, jasper, and amethyst. Also included are the polishing powder, 2 x ring mounts and one key chain accessory. The tumbling unit is mains operated with 3 timer settings and the process is very noisy! It’s best to set this up somewhere where the noise won’t be annoying, like a garage.
- PATIENCE REQUIRED – Your child also needs to be patient, it can take 2 to 4 weeks to achieve the result they are after, it’s a good idea to check the progress regularly to see how things are going. The good news is that what can take 1000s of years in nature can be achieved in a matter of weeks using a rock tumbling machine!
- UNCOVER THE BEAUTY OF ROUGH STONES - Your child can experiment to see which (apparently) dull, boring stones from around the world can be turned into exciting shiny ones. They’re perfect for collecting, for decorating display items like a picture frame, or creating jewellery. Promote their interest in science as they learn (and teach you!) all about geology.
- CREATE HOMEMADE JEWELLERY - This Rock Tumbler smooths rough stones during the tumbling process, then you can use the polishing powder provided to bring them to a high shine. The kit includes a keychain accessory which can hold a small stone, there are also 2 ring mounts, using glue (under adult supervision, glue not included) attach your gems and wear/display your very own jewellery..STEM LEARNING FOR KIDS - All Science Mad products are designed specifically for children.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 23 x 26.5 x 22 cm; 100 g |
| Manufacturer recommended age | 10 years and up |
| Item model number | SM42 |
| Educational Objective(s) | Imagination Development |
| Number of Game Players | 1 |
| Number of Puzzle Pieces | 1 |
| Assembly Required | No |
| Batteries Required? | No |
| Batteries Included? | No |
| tech_spec_battery_description_toys | No batteries required |
| Material Type(s) | Plastic |
| Radio Control Suitability | home |
| Color | Multicolor |
| ASIN | B07XTXHQDQ |

## Images

![Science MAD! SM42 Rock Tumbler, Multi - Image 1](https://m.media-amazon.com/images/I/71CN64dfyRL.jpg)

## Frequently Bought Together

- Science Mad Rock Tumbler Machine For Kids - Learn About Rock Tumbling, Polishing and Gemstones With Fun - Includes Rough Gemstones and Jewellery Making Kit, 10+ Years, Multicolor
- My Book of Rocks and Minerals: Things to Find, Collect, and Treasure
- National Geographic Rock Tumbler Refill Kit – 453 g Gemstones and Rocks for Tumbling including Unpolished Amethyst and Quartz – Rock Tumbler Supplies include Rock Tumbler Grit & Jewellery Accessories

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-17*