---
product_id: 725864907
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: "€ 179.13"
currency: EUR
in_stock: true
reviews_count: 5
category: "Kool Stone"
url: https://www.desertcart.ie/products/725864907-c1-rock-tumbler-kit-professional-large-2-5lb-capacity-up
store_origin: IE
region: Ireland
---

# 75% quieter rubber barrel 9-day adjustable timer with memory 2.5LB large capacity 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:** € 179.13
**Availability:** ✅ In Stock

## Summary

> 💎 Turn rough rocks into polished gems—quietly, precisely, and effortlessly!

## 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?** € 179.13 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/725864907-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:** Includes everything from rough stones to polishing grits and ceramic media—jumpstart your rock tumbling journey instantly.
- • **Whisper-Quiet Operation:** Rubber barrel reduces noise by 75%, so your workspace stays peaceful and focused.
- • **Precision Polishing Control:** 3-speed settings and a 9-day timer with memory function give you tailored, flawless results every time.
- • **Maximize Your Gem Collection:** Generous 2.5LB capacity lets you polish more stones per cycle—because your creativity deserves volume.
- • **Family-Friendly & Educational:** Perfect for parent-child projects, fostering creativity and STEM skills with hands-on fun.

## Overview

The C1 Rock Tumbler Kit features a professional-grade 2.5LB capacity with a noise-reducing rubber barrel that’s 75% quieter than plastic alternatives. It offers 3 adjustable speeds and a 9-day timer with memory for customized polishing cycles. This all-inclusive kit comes with rough stones, polishing grits, ceramic media, and accessories, making it ideal for hobbyists and families eager to transform raw rocks into stunning polished gems.

## Description

Product 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. Safety Warning Please always keep your hair away.

Review: The tumbler works well, and their customer service is great. Daisy was really quick to respond and friendly. Thank you!
Review: Edit 11/29/23. Still love this tumbler. Had a problem with it. Contacted customer service and they took care of it right away. Awesome company, and the best service! Makes a terrific gift for the holidays. We got one for our grandkids this year. Got this tumbler for Christmas. Favorite gift this year. I Love going out and Beaching and finding Afates, Jasper and Quartz treasures. This unit is great! It's quiet, works well and the company has responsive customer service. It comes with a beautiful color instruction manual. The manual isn't bad. But I've learned from groups that tumble on Facebook and forums that there are several things tumbler manufactures get wrong in the instructions. The biggest one is speed. This tumbler spins too fast in all speeds and will bruise stones easily if you run it in speed 3 or 2. So always run it on speed 1. The manual lists RPMs at the axle I timed the RPMs of the barrel and that is rotating at 70-90. It is still faster than recommended but if you fill the barrel as close to 3/4 as possible along with ceramic filler you can minimize bruising. I included picks from my 2nd Tumble and they turned out good with speed 1 and mostly full tumbler. After first cycle you will need to have filler for other 3 cycles. Ceramic works but if you don't have enough ceramic to fill close to 3/4 I found decorative glass beads at the dollar store that work great as filler. I also use 2 tbs of Borax between each cycle and run for 2 hrs will clean the grit from rocks and tumbler pretty well which is essential por good polish. After polish cycle I run for 2 hrs with 2 tbs Ivory soap flakes to help increase shine. Also be careful in cycle one with small stone as this tumbler turns very fast and small stones can dissappear if you run it for a full week. So I check after 4 days to see if I should pull them out and sub in glass beads as filler. Some stones make take more than a week in first cycle. Agates take awhile and you don't wants pits or irregularities to carry grit into polish cycle. So I try to get very smooth in first stage. Anyways this tumbler is alot of fun and I am looking to purchase other tumblers now. I am particularly interested in a vibratory tumbler, they are much faster and use less grit. Potentially you can have polished rocks in a week instead of a month.

## Features

- Belts are consumables, so we'd like to offer extra 5 belts for spare use.
- START A TUMBLING JOURNEY -- Koolstone 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 -- An updated features is that KoolStone Rock Tumbler has a large 2.5LB capacity. Which allows to tumbler more rocks each time. Another improvement is the quieter barrel. Rubber material which has 75% quieter than most plastic barrel.
- 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..EVERYTHING YOU NEED FOR TUMBLING IS HERE -- KoolStone Rock Tumbler has everything you need to create polished gemstones. Rock tumbler, 2.
- International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09YM33DGD |
| Assembly Required | No |
| Batteries | 1 AA batteries required. |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 3,157,216 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 492 in Polishing & Buffing |
| Colour | C1 |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,062) |
| Date First Available | 14 May 2022 |
| Educational Objective(s) | Creative Skills |
| Item model number | KS20220422 |
| Manufacturer recommended age | 8 years and up |
| Material Care Instructions | Hand Wash, Machine Wash |
| Material Type(s) | Rubber |
| Number of Game Players | 1 |
| Product Dimensions | 28.5 x 22.91 x 14.5 cm; 2.84 kg |
| tech_spec_battery_description_toys | AA batteries |

## 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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by G***S on 11 December 2025*

The tumbler works well, and their customer service is great. Daisy was really quick to respond and friendly. Thank you!

### ⭐⭐⭐⭐⭐ Review
*by T***D on 12 March 2023*

Edit 11/29/23. Still love this tumbler. Had a problem with it. Contacted customer service and they took care of it right away. Awesome company, and the best service! Makes a terrific gift for the holidays. We got one for our grandkids this year. Got this tumbler for Christmas. Favorite gift this year. I Love going out and Beaching and finding Afates, Jasper and Quartz treasures. This unit is great! It's quiet, works well and the company has responsive customer service. It comes with a beautiful color instruction manual. The manual isn't bad. But I've learned from groups that tumble on Facebook and forums that there are several things tumbler manufactures get wrong in the instructions. The biggest one is speed. This tumbler spins too fast in all speeds and will bruise stones easily if you run it in speed 3 or 2. So always run it on speed 1. The manual lists RPMs at the axle I timed the RPMs of the barrel and that is rotating at 70-90. It is still faster than recommended but if you fill the barrel as close to 3/4 as possible along with ceramic filler you can minimize bruising. I included picks from my 2nd Tumble and they turned out good with speed 1 and mostly full tumbler. After first cycle you will need to have filler for other 3 cycles. Ceramic works but if you don't have enough ceramic to fill close to 3/4 I found decorative glass beads at the dollar store that work great as filler. I also use 2 tbs of Borax between each cycle and run for 2 hrs will clean the grit from rocks and tumbler pretty well which is essential por good polish. After polish cycle I run for 2 hrs with 2 tbs Ivory soap flakes to help increase shine. Also be careful in cycle one with small stone as this tumbler turns very fast and small stones can dissappear if you run it for a full week. So I check after 4 days to see if I should pull them out and sub in glass beads as filler. Some stones make take more than a week in first cycle. Agates take awhile and you don't wants pits or irregularities to carry grit into polish cycle. So I try to get very smooth in first stage. Anyways this tumbler is alot of fun and I am looking to purchase other tumblers now. I am particularly interested in a vibratory tumbler, they are much faster and use less grit. Potentially you can have polished rocks in a week instead of a month.

### ⭐⭐⭐⭐⭐ Review
*by B***S on 27 November 2022*

This is an excellent tumbler that does what it's supposed to do. It provides a simple introduction to rock tumbling for the young adult beginner yet will give you beautiful professional results if you use it the way the pros do. You might not get pro results following the instructions the first time. Remember, it's just an introduction providing an overview and demonstration of tumbling. If the kit ends up giving you nicely rounded but very dull unfinished stones like I experienced, you'll be disappointed of course and think the tumbler stinks. But make sure you watch a few pro tumbling YouTube videos after your first experience with this kit. Then you'll know what to do the next time. For example, I found Cycle #1 at Speed #3 just too fast. The stones got really beaten up, and the tumbling was pretty loud. It might need to tumble much slower. I also tumble coins I find ocean beach metal detecting. This tumbler is perfect for cleaning up those nasty coins that have been in salty sand/salt water for weeks and months. I've attached some before and after self-explanatory pics including rows of washed and dried coins, drums before and after each type of coin and the tumbling medium. I won't go over the contents of the whole kit. Other reviewers have listed everything. It may seem at first like a cheaply built toy tumbler when you first pull it out of the box having been very nicely packed, but this is not a junky toy. It is built to do the job. If you treat it right, it will last. When you open the box, don't take the tumbler out yet. Pull out the water resistant, very well written and thorough manual. Read it cover to cover. I could describe all the dos and don’ts here, but the manual does the job quite well. I've read the reviews. From the problem descriptions, you'll understand that some folks simply didn't read the manual through. But if you have any problems at all or don't quite understand what to do contact Customer Service. You'll get Anne or Daisy. Daisy is 24/7 amazing. She’ll talk you through any issue or problem you’re having. Customer Service is not an easy job. But she (and Anne) will not stop until you're happy. You've seen their great reviews. But they're understatements. Daisy.....10 stars!

## 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 Ireland*
*Store origin: IE*
*Last updated: 2026-03-13*