C1 Rock Tumbler Kit - Large 2.5LB Rotary Rock Tumbler for Adults & Hobbyists, Quiet Rubber Barrel, Adjustable Timer & Speed, Complete Gem Polishing Kit with Memory Function

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..

Product works well. Arrived with extra belts, some stones, grit, and ceramic. Customer service A+. MOTOR died two weeks into tumbling; I contacted customer support and messaged with Daisy. She sent out a replacement motor which I received within a week. Also sent out a screw driver and extra screws, and emailed a link to a video to show how to take out the old motor and replace it. Replacement was easy. Machine is up and tumbling again! Barrel size is larger than my other tumbling barrels. Noise level isn't quiet, but it isn't outrageous either. It is compact, light weight, and for the money, it is an excellent product. The bonus is the customer service.

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!

Great beginner tumbler. Kit includes everything needed to get started right out of the box (tumbler, stones, grit kit, jewelry findings, instructions) and a generous 1 year warranty. Digital controls regulate on/off, rpm, and number of days per tumble and work smoothly and accurately. Grits include coarse, medium, fine, polish, and ceramic tumbling beads to cushion stones during the tumble. Stones are dime to quarter size quartz, jasper, etc and do tumble nicely. The jewelry findings are definitely kid oriented but are a nice inclusion. Only negative is that some reviewers find that the drum spins too fast for a really good polish. T his is discussed on many Youtube videos. I feel the tumbler is fine for kids or amateur adults and certainly a step up from the others I have used in the under $100 dollar range, especially given the generous 1 year no questions asked guarantee. Recommended.

My husband bought me a Koolstone 2.5LB Professional Rock Tumbler Kit in October 2022. I was having so much fun, I decided to purchase a 2nd one. Upon arrival, I was disappointed to find that one of the pulley wheels was damaged and an error code displaying. I contacted KoolStone support and Daisy responded within a couple of hours! After discussing the problem, KoolStone shipped out a new tumbler base and within 4-5 days I was back in business. Daisy even followed up afterwards to ensure everything was running properly now. Best customer support I've received in a long time! Overall, the kit includes everything needed to get started with rock tumbling. About 1lb of rough rocks are included, though for total beginners I recommend studying up on rock identification and separating those with a lower Mohs hardness. My kit had obsidian and sodalite which are a bit softer than the quartz, agate, and jaspers that can all tumble together well. The sample grits work pretty well. I didn’t have as much luck initially with the polish included, but as a beginner I likely may have removed them from the pre-polish stage prematurely or skimped on the wash cycle before moving onto polish. If you don’t have additional rough rocks, especially of a smaller size, be sure to use enough of the ceramic media included to cushion the rocks and transport the grit. I’ve since purchased additional grit and media in larger quantities (the Polly Plastics kit isn’t bad, but I’ve come to prefer ordering from the Rock Shed). If you’re not happy with the results, you can always return to a previous stage and try again! Patience and practice is key here :) The kit also includes various jewelry findings to make spiral cage necklaces, keychains, and more. I am grateful this kit includes extra replacement belts. In the 5 months I’ve been running these tumblers, I’ve replaced one belt on each. Overall, I’d highly recommend the KoolStone 2.5LB Tumbler kit to anyone looking to get started! I’ve had a blast trying different types of stones and methods of tumbling/polishing, and the results are just awesome. And despite some initial problems, KoolStone stands behind their products and is committed to providing amazing customer service!

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.

I've had no problems, runs 24/7 with no issues. They sent free belts as a gift after purchase. Customer service is excellent, Daisy always replies to emails right away and is willing to help with any questions or requests I may have.

Really like this machine so far. The two belts that came with it broke within the first few days of operation but the company anticipated it and sent me several replacement belts when I registered the purchase. Did not miss any cycles. I let it rest a day or two between cycles.

Worked for a month then the motor gave up, I followed all the instructions on weight. The belts are also poor quality, went through 2 In just a month.

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.

Edit Nov 12: I have to say my experience with Koolstone has been fantastic! Top notch customer service. Very quick response, very polite and understanding. They quickly resolved my problem by replacing my “lemon” and I am back and tumbling. After a week or so they even reached out again to make sure everything was still running smoothly and that I was happy. Thank you 😊 EDIT Oct 25: more disappointment! The tumbler just randomly stopped mid cycle. I had it on speed 2 for 6 days, I had 2 days left and it just stopped. At first I didn’t think much of it and checked my rocks. They looked ok so I rinsed and was doing a 2hr cycle on the slowest speed to wash them between cycles. After 30 min I went to check to make sure everything was going good and it wasn’t tumbling anymore. The lights are on, shows days (1) and speed (1). But nothing happens when I hit start. I’ve unplugged it and everything, and yes the belt is still good. At this point this tumbler has caused more grief then enjoyment and want my money back! I was super excited to get this. Read the directions a couple times to make sure I did it all correctly. Went through stage 1 twice. Stage 2, 3 and 4 once. The final outcome was nothing but disappointment. Zero shine at all. So went back and watched a few dozen videos. Threw them all in the tumbler with a bit of powder laundry soap(videos used borax but I didn’t have any) for about 2hrs to make sure they are very clean. Rinsed really well and back in stage 3. Once that was done I did another laundry soap rinse for 2 hrs, rinsed well and on to stage 4. They are not shiny at all!!!!! The rocks that came with the kids have shrunk so much too! Very frustrating and disappointing. Wish I could get the original rocks again cause this definitely wasn’t the outcome that was promised 👎🏻 Giving a 1star for the outcome As for the tumbler itself, it’s been running almost none stop for 2 months and haven’t had any issues. Did change the belt cause it snapped. But other then that it seems to be working as it should.

Grandson loves his tumbler

Product works great. Easy to read manual & easy to use. Excellent customer care.