Rock Tumbler Kit for Adults Kids, Professional Rock Polisher with 3LB Leak Proof Rubber Barrel, Includes 1 LB Rough Rocks,4 Rock Tumbler Grits etc,STEM Christmas for Kids

I have several rock tumblers and this is the most reliable and highest quality of the bunch. It has no problem turning a heavy barrel that bring my other tumblers to a halt. This is a pricier model and you can get two cheap tumblers for the price of this one. If you are buying for a young child and suspect they will lose interest after a few batches, you might not need this tumbler. Otherwise, I think this tumbler is a great way to go. Keep in mind, this is made of plastic and not indestructible. The huge metal professional tumblers cost about $1k. There are tumblers with metal housings around this price, which may be more outwardly durable. They are a good choice if your kids plan on throwing their rock tumbler off a roof. I had a rock tumbler of that style and it only lasted for a few batches and died. Others said they short circuit and could cause fires. Kids who throw rock tumblers off roofs may like a bit of pyrotechnics, but since most of us leave our tumblers unsupervised in garages and basements, the fire hazard is a deal breaker. Those tumblers also don’t have multiple speeds or a timer. TL/DR. This is the best tumbler in this price range.

Great rock tumbler. Not too loud during the tumbling process. The rocks and sea glass I tumbled looks fantastic!

On the one I purchased, the belt broke after 2 weeks. Put on the replacement belt (included) and it broke as well after 3 weeks. Contacted seller and to my surprise, they didn't send a replacement belt, they sent an entire new tumbler so now i have two of these. The belts on Amazon are pricy, about $17 each. I went to my local ACE Hardware store and bought a "medium O-ring assortment kit" for $7 which includes 6 rubber o-rings, at least 4 of which will fit the tumbler. Problem solved! I also purchased a spray can of rubber belt treatment/conditioner at O'Reilly auto parts to spray on the O-rings. Aside from the belt issue, this is a great little tumbler which I believe the o-ring solution should work just fine. Very pleased!

Cool toy. I collect rocks when I'm walking my dog and this sits in the garage and cranks away so far so good. I'm only posting this because I had posted a question and now found the answer. I lost the knob and wanted to know how to replace it. Turns out I had a nut kit and the 39-M6 fit, so I can just use that with a washer and it will work fine. However, I also wanted a replacement knob, just search for "star knobs with female thread".

I’m am so disappointed in this product. I used it once and it quit after the first day in the polishing step, step 4. It is kind of difficult to have an item that can take up to two weeks to finish a project and get into another one when you are leaving on a small vacation. I tried everything suggested in the instructions, I emailed the company which guaranteed a response within 24 hours. Nothing! Now I’m stuck with a rock polisher that doesn’t work and I never even got a complete set done!!!

Awesome rock tumbler. I love it. The best one I’ve used yet. I love the large 3lb barrel. Haven’t missed a beat I’ve been running it since I got it and the belt that came on it is still rocking and rolling it’s been almost 2 months. AWESOME!!!!

I was excited when the tumbler came in. This is not the first one I tried. I ran a batch with the first coarse grit and it did well out side of some major rubbing on the barrel against the gears that turn the rollers. It started out nearly silent which was amazing but after day one I had to cover the tumbler with a plastic tub to mute the noise which was disappointing. Finally finished the first run and started the second grit. This is where things got.. messy. Yesterday when I checked in the morning the tumbler was still running with two days remaining. Yesterday afternoon one of my boys told me the tumbler had stopped. Finding this puzzling I went to investigate. The tumbler errored out and there was grit residue all over the tumbler and the barrel. Now keep in mind I have the same amount of rocks in the tumbler and had added the other stuff as instructed. Now I have to figure out how to get the residue off the rollers and gears because the thing won't turn with the barrel on at all

Worked for a couple of months for one full batch, rocks came out decent, the container is very sturdy and indeed leakproof. Unfortunately the tumbler started squeaking really really really bad so I oiled the rotors and the extremely brittle belt then it stopped working. Probably too much oil got into the wrong place but the tool needed to unscrew the belt section must be very thin and long and I don’t have one. It’d be nice if this came with one, along with a replacement belt and oiling instructions…which might be in the book I just didn’t see it. Anyways I gotta get a new one. This time I’m buying one where the belt is exposed for easy access.

Extremely easy to use, and I love that it has the timer and memory features. It has a very tight seal and is significantly quieter than other tumblers I have used. Seems to be high quality and well made. The only reason I didn't give it 5 stars is because it's too early to see the results yet!