100 Pack 608-2RS Skateboard Bearing, Rolling Bearings, 8x22x7mm 608rs Bearing

Very smooth rolling. Capable of use with heavy load

No nylon cage contrary to description. Metal cage. Non removable type.. Seals (shields?) are black, not red (not that it matters that much) but made of thin, flimsy plastic material. All the bearing shields Ive seen have been made of some type of thin metal alloy material, with a rubberized coating on one side. Not these. These flex a lot and dont seem too precise a fit, compared to the other type. The bearings had kind of a scraping quality to them, not smooth or particularly quiet. I had heard that its better to buy cheap bearings because the ABEC rating doesnt matter all that much unless its a very, very high RPM application youre using them for and that if you go for a higher ABEC rating, youre just wasting your money.. But I suspect theres something going on with these bearings that doesnt have to do with the ABEC rating at all. Not sure what it is. But maybe the moral of the story is that you just cant get 100 good quality bearings for $20? Perhaps. * Since originally posting this, Ive come to the conclusion that the problem lies with the metal cages that hold the individual ball bearings in these bearings. Because everything else about them, with the exception of the flimsy black plastic shields that probably arent really contributing to any problems (despite being flimsy) ...everything else about these bearings seems to be fairly similar in quality to other similar bearings that Ive had EXCEPT for these metal cages. They just seem to be made of a very thin metal and also seem quite flimsy and not precise.. and they are important. In fact I noticed that one of the individual ball bearings in one of these cages wasnt even centered properly in its little cup. So I think this is the problem. Which is why they scrape and do not roll smoothly in my opinion

They are super cheap! If you go through bearings fast then this is definitely the way to go! But they arent the most durable or the greatest quality.

Cheap and cheerful. The rubber seals make removing the grease easier. Price is right for simple 3D printer projects.

Price cannot be beat. Not even my Chinese contact could come close to this (I could only get 10 overseas for this price). I have yet to test durability, but there are reviews of this product on that and I wont be using them in a manner that could wear them out.

So I opened the a contaner, each one has a set of ten. First thing I noticed is the seals looked odd. So I pop one out, they are plastic, not rubber of any kind. Thereis very very little grease inside, could be a good thing or bad depending on your use. My intened use is for a bearing to last so I need grease inside. So I check 10 more same thing. That takes me to the biggest problem. These called seals you can see the balls inside with the seals in place from the factory. No way will they seal in the grease or keep dirt out.

The inner race has the worst tolerances ive ever seen in my life.

Poor manufacturing & blunt tooling along with piss poor quality control have rendered these bearings useless. Machining of the metal races is so low along with bearing cages that are concentric means the bearings are worn out before you even use them. DO NOT BUY THIS JUNK

These bearings served my needs well. Highly recommend.

WayneChicago is right on with his review and the cleaning. I bought some ZZ bearings I thought were compete rubbish (ironically the same brand/seller without knowing) Then I bought some more expensive RS ones, that were nicer, but a lot more. I needed a lot for my project, I saw his review and the comments on cleaning and I took a chance. When I realized the rubbish ones were the same brand, I tried cleaning those first and I was very happy with the results. Heres my observation/experience. Originally I soaked them in WD40 for seconds, maybe a whole minute, but I thought the WD40 would cut that grease. I think with some, probably the ZZ ones I had, the grease hardens and particles become the grit. Soaking for 6+ hours certainly broke down the grease. I noticed 2 ZZ didnt spin as fast as the others, so I put them back to soak. While soaking, I tried shaking them up every now and then, mostly it just sat there. Upon taking them out, I spun them before drying, some didnt spin so great, but got better and better as I spun them. I think longer soaking may have helped, I probably should have let them soak all day. The set I got came in 2 paper boxes. Each box had 5 tubes of 10 bearings. The bearings were all uniform, and generously coated with some grease. They didnt spin very well in that condition, There were no deformities, there were no defects in the lot. My application is fidget spinners, and after cleaning and light oiling they spun exceptionally well. If you need to take them out of the box and use immediately these probably arent for you. Unless of course your application requires the grease. But if you dont mind cleaning and oiling. They are quite the bargain. Just remember if you clean them, do it safely and well ventilated and Im thinking the longer they soak the better. The cleaning liquid I used was dark blue/green after all the soaking.