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










| ASIN | B09YM33DGD |
| Age Range Description | Suitable for children aged 13 and above |
| Best Sellers Rank | #194,770 in Kitchen ( See Top 100 in Kitchen ) #3,023 in Tumblers & Water Glasses |
| Brand Name | KoolStone |
| Color | Brush Edition: C1 |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,169) |
| 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 [email protected] to take replacemenet. 3.) Any problems before purchasing please reach out at [email protected] 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 |
A**S
Great small rock tumbler….
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..
D**Y
Solid construction
This is well built and not at all a toy. We're only partway through our first set of rocks but we eagerly anticipate each new tumble. There was an issue with the drum but the company very quickly addressed it and sent a replacement. Very impressed.
N**S
Study good quality
Grandson loves his tumbler
G**H
Great for a First Time Tumbler
For a first time rock tumbler this is great! Super easy to use- the instructions are clear & simple to follow. The machine is easy to use & pretty quiet for what it is, but I also have nothing to compare it with. It's small enough I'd take it camping with me as long as I've got an electric site. I've just started the second phase & the first phase worked well!
P**Y
Great Tumbler for a Happy Birthday Girl
My 8yr old daughter wanted a rock tumbler for her birthday and I am very happy with this model. It works great, it’s easy to use, and it’s easy to clean. The only thing I would say is that you should read the instructions closely because I didn’t read them closely enough for the final stage. If I had, my rocks would have been more polished had I made sure to follow the steps. That being said, it was my own fault because the instructions were clear and easy to follow, I was just in a hurry😄. I’ll update in the next batch when I follow the instructions with more precision. Customer service is very helpful and you get free belts and another rock sample if you send in the code. The tumbler does make some noise, but that’s easily solved if you put it in your garage or a corn of your home away from everyone. My daughter loves how the rocks turned out and is very excited for the next round. As someone who always wanted a tumbler, I enjoy spending time with my daughter on this pursuit. I am very happy with the purchase and am looking forward to more rock adventures.
Trustpilot
1 month ago
1 week ago