K1 Pro Professional Cutting-Edge Brushless Motor Advanced Rock Tumbler Polisher Kit, Large 2.5Lb Barrel with 3-Speed & 9-Day Timer, Includes All Accessories, Ideal Gift for Adults & Collectors
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Availability:
In Stock.
Arrives
Wednesday, May 20
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Color: Brushless Motor: K1 Pro
Features
- SAFE FOR KIDS CERTIFIED NON-TOXIC AND FAMILY FRIENDLY: KomeStone rock tumblers enjoys the CPC certification (Children's Product Certificate) issued by the federal government, and made from non-toxic, child-safe materials, ensuring a fun and educational STEM learning experience parents can trust. Smooth edges, secure closures, and low-noise operation make it a safe and engaging rock tumbler gift for curious young explorers.
- DIVE INTO THE FUN ROCK TUMBLING: KomeStone rock tumbler is for turning rough raw rocks into smooth gemstones. Youll be excited to see the rocks change with each cyclea great lesson in patience for kids or inspiration for jewelry-making moms.
- 2025 K1 PRO UPGRADE: Professional Tumbling Innovation Features a smart LCD with 9-day programmable timer, 3 speeds, and pause function. Its brushless motor ensures 20,000+ hours of quiet operation, while the military-grade thickened rubber barrel guarantees durability. Create museum-quality gemstones with pro-level control.
- 2.5 LB EXTRA LARGE CAPACITY & QUIETER: We use the 100% soft rubber barrels which can absorb the impact of the tumbling rocks and its 75% quieter than that of other plastic drums, which likes the sound of a working dishwasher. With 2.5lbs extra large barrel, that means you can polish more rocks at once than 1 lb drum.
- COMES WITH EVERYTHING YOU NEED: Including the tumbler machine, the barrel, 1lb rough rocks, extra belts, 4 polishing grits and ceramic filler media (As a gift in package) and other accessories, etc. Especially the full-color Instruction book, detailed and clear to follow, even a starter knows how to use it independently.
- SCIENCE-BACKED POLISHING FOR PRO-LEVEL RESULTS: Achieve museum-quality shine with our 4-stage grit system (60/) and precision ceramic media. The leak-proof stainless steel lid ensures mess-free tumbling, while our exclusive guide unlocks pro techniques.
- About KomeStone: KomeStone rock tumblers are the first with brushless motor technology and now lead U.S. sales by a wide margin. We are more than a manufacturer were your partner, offering reliable products and lifetime support you can count on.
Product Dimensions: 11.22 x 9.02 x 5.17 inches
Item Weight: 2.5 pounds
Item model number: K1 Pro
Manufacturer recommended age: 13 years and up
Is Discontinued By Manufacturer: No
Manufacturer: KomeStone
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, May 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Color: Brushless Motor: K1 Pro
Alright, rock enthusiasts and aspiring geologists, gather 'round! I recently acquired the KomeStone K1 Pro Professional Cutting-Edge Rock Tumbler, hoping to transform my collection of backyard pebbles into sparkling treasures worthy of a museum (or at least, my mantelpiece). This machine is, indeed, cutting-edge... or at least, it cuts through the rough edges of rocks with impressive dedication. It's like a tiny, geological spa for your stones, giving them the smooth, polished glow they've always dreamed of. My rocks are now so shiny, I'm pretty sure they're starting to develop egos. The "professional" part? Well, it certainly sounds important, and it feels pretty robust. It hums along, doing its thing, turning mundane rocks into mini works of art. I've spent an embarrassing amount of time just watching it spin, mesmerized by the slow, steady transformation. It's surprisingly therapeutic, almost like a lava lamp, but with more potential for bling. My only minor quibble is that I now have an overwhelming urge to collect all the rocks. Every walk is an archaeological dig, every pebble a potential masterpiece. My pockets are perpetually full, and my family is starting to eye me suspiciously when I bring home yet another bag of "future gems." This tumbler is so effective, it's turning me into a rock hoarder. So, if you're looking to polish your pebbles (and perhaps your patience), the KomeStone K1 Pro is a solid investment. Just be warned: you might develop a serious case of "rock fever." It's a gem of a machine, and I'm totally rocking my new hobby!
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Reviewed in the United States on July 16, 2025 by KJo
Color: Black
So far, this has been a really great tumbler and runs perfectly. I like the timers and speed settings. The tumbler is as quiet as a rock tumbler can be, which if you've ever had one, you know they do make some noise. The company sent extra belts free of charge, instructions for how to get the extra belts included in the kit! The instructions were good and the tumbler is easier to open than my older tumbler as the barrel is soft and bendable. No leaks and handles 3/4 full load of rocks and grit with no problem. I'm through with my 2nd round and the tumbled rocks look good so far. I did not use the rocks that came with the tumbler as I have a bunch of my own already but there was a good selection included with this tumbler. I'm also not using the grit that came with the tumbler as I use a higher grade purchased from another company that has aluminum oxide 500 for the 3rd step rather than silicon carbide that's included with this tumbler. Overall, I'd recommend this tumbler as a good starter tumbler for adults or children interested in the wonderful world of rock tumbling!
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Reviewed in the United States on February 3, 2025 by Silent Siren
Color: Black
I am SO happy with this purchase! I shopped around and finally decided on this particular tumbler. I am currently on step 4 polishing and have been amazed each step with how well it's worked. I had an issue with a part, due to user error, and the customer service folks responded to my email right away, shipped me the new part and then followed up to be sure it arrived and was working! It's been heartwarming to have found such a caring company with integrity, and a sincere love for rocks :) thanks KoneStone!!!
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Reviewed in the United States on January 30, 2026 by laura vyvyan laura vyvyan
Color: Black
So far this machine works great, my only complaint is that the O ring that attaches to the pully that makes the thing spin broke in 4 days, that's the reason for the missing star. I am going to go to a big box store and get some rubber O rings in the appropriate size, but I am still running my first batch so I hope the second one does not break in another 4 days! The bands that run the pulleys are not totally rubber, I am not sure really what they are made of but I don't want to keep replacing them every 4 days! I am not even running rocks, I bought this to make sea glass for my art projects which is not as heavy as rocks would be. I would think would not put as much strain on the pulleys or tumbling motor due to the lighter weight of the material inside. The description also says "Large Capacity" the user manual says to only fill the drum 1/2 to 2/3 full but in reality it seems like a very small amount if you run the thing for almost a full month for the complete recommended cycle. They give you enough of the grit to run one complete cycle, buying more grit is expensive so I am hoping to find it on sale! I have already looked at some craft and hobby stores in the area and none that I have found carry the grit or the rock tumbler machine for that matter. The pause button is a useful feature. It says not to place this on a table or counter when using because due to the tumbling action it might cause the machine to move around a bit and fall to the floor. I have mine sitting on my garage floor for this reason and the noise issue. It is kind of loud, not terrible but not something you would want to hear when trying to sleep, watch tv. or relax.
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Reviewed in the United States on January 18, 2026 by Cathy