---
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: "¥41099"
currency: JPY
in_stock: true
category: "Kool Stone"
url: https://www.desertcart.jp/products/456405375-c1-rock-tumbler-kit-professional-large-2-5lb-capacity-up
store_origin: JP
region: Japan
---

# 75% noise reduction 2.5LB large capacity 9-day programmable timer 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:** ¥41099
**Availability:** ✅ In Stock

## Summary

> ✨ Turn rough rocks into polished treasures—quietly, smartly, and stylishly! 🪨

## 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?** ¥41099 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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

- • **Complete Starter Kit:** Everything you need from rough stones to jewelry findings, plus polishing grits and ceramic media—kickstart your gem journey instantly.
- • **Step-by-Step Success:** Illustrated guide walks you through each stage, making rock tumbling a rewarding STEM hobby for beginners and pros alike.
- • **Built to Last & Backed:** Includes 3 spare belts, responsive support, and a 1-year warranty—because your passion deserves durability and peace of mind.
- • **Polish More, Wait Less:** Spacious 2.5LB rubber barrel lets you tumble bigger batches with up to 75% less noise—perfect for home or workshop vibes.
- • **Smart Control, Zero Guesswork:** Adjust speed across 3 settings and program up to 9 days with pause, resume, and memory functions for flawless polishing flow.

## Overview

The C1 Rock Tumbler Kit by KoolStone offers a professional-grade 2.5LB capacity with a noise-cancelling rubber barrel that’s 75% quieter than plastic alternatives. Featuring a 9-day programmable timer with pause, resume, and memory functions, it ensures precise control over polishing stages. This all-in-one kit includes rough stones, polishing grits, ceramic media, jewelry findings, and an illustrated guide, making it ideal for adult beginners and hobbyists. Backed by a 1-year warranty and dedicated customer support, it’s the perfect tool to transform rough rocks into stunning polished gems.

## 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.

## Features

- Designed for Adults and Beginner Hobbyists – Turn rough rocks into polished gemstones with an easy-to-follow home tumbling system. The complete kit, simple controls and step-by-step guide make it easier to start your first batch while still offering enough capacity for an ongoing rock-polishing hobby.
- Large 2.5 lb Capacity with a Quieter Rubber Barrel – Polish more stones in each batch with a spacious 2.5 lb barrel—a practical step up from smaller 1 lb starter tumblers. Its thick rubber construction helps cushion rock impact and produces up to 75% less noise than typical plastic barrels for a more comfortable tumbling experience in garages, workshops and hobby spaces.
- Smart Controls with Pause, Resume and Memory – Choose from 3 speed settings and program each polishing stage with the clear 9-day digital timer. Pause the tumbler to check your rocks, then resume the batch without starting over. Automatic shutoff stops operation when the selected time ends, while the memory function restores your previous settings after a power interruption.
- Complete Kit for Your First Tumbling Batch – Includes a 2.5 lb rubber barrel, 1 lb of rough gemstones in 9 varieties, 4 polishing grits, ceramic tumbling media, a mesh strainer, jewelry findings, an illustrated step-by-step guide and 3 drive belts. The essential supplies for completing your first polishing journey and turning finished gems into keepsakes are included.
- Clear Guidance from Rough Rocks to Polished Gems – Follow the illustrated guide through each stage of the tumbling process. Each stage generally takes several days, and full results may take a few weeks depending on the rock type, size and desired shine. The tumbler is suitable for agate, jasper, quartz, aventurine, tiger’s eye，sea glass and similar hard stones.
- Replacement Belts and Responsive Customer Support – Three included drive belts help keep future tumbling batches moving, while replaceable components support continued use over time. The KoolStone support team is available to help with setup, operation, troubleshooting and replacement-part questions as you build experience with the hobby.
- Over 1,000,000 KoolStone Rock Tumblers Sold In The U.S. – Trusted by families and hobbyists across the country, KoolStone has helped make rock tumbling more approachable and enjoyable. The C1 combines simple controls, practical capacity and complete supplies to help new users begin tumbling with confidence. Based on internal KoolStone U.S. unit sales data through June 2026.
- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09YM33DGD |
| Age Range Description | Suitable for children aged 13 and above |
| Best Sellers Rank | #218,951 in Kitchen ( See Top 100 in Kitchen ) #3,253 in Tumblers & Water Glasses |
| Brand Name | KoolStone |
| Color | Brush Edition: C1 |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,244) |
| 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/81hC+5nU+gL.jpg)

## Available Options

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

## 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 Japan*
*Store origin: JP*
*Last updated: 2026-08-22*