608 Bearing Skateboard Deck Skidding Spinner Bearing,ABEC-9 Precision Speed Bearing, Ceramic Hybrid/Chrome Steel, Black Surface, Super smooth

These are super smooth. They come with no grease. That's a plus for some. For others like me it was simple to pop the seals off each side with a razor blade and inject with my favorite AMS oil grease. Now they will be perfect replacement idler pulley bearings on my racing recumbent bike.

Excellent bearings!!

Broke within 3 days

These bearings were purchased for use on my electric skateboard. I opened them up to see if they were true hybrid ceramics and indeed it looks like they are. Hybrid ceramics have the benefit of less maintenance and faster rolling speeds than steel bearings. For high impact and rough roads that skateboards undergo, hybrids are the way to go as full ceramics are more brittle.The good:1) Great rubber seals, these will keep dirt and particles out. This will extend the life and reduce maintenance.2) Decently priced3) Good performance - I noticed that my board rolled a little longer than my previous steel bearings. They have a slight hollow sound, which is normal for ceramics than a thud.I would have to give these a 3.5 star out of 5 for the following reasons:1) Came with no form of grease/lube - while that isn't too big of a deal for some, you still need some form of lubrication with hybrid bearings. Only full ceramic bearings can run without lubrication. I added in 3 drops of lube as seen in the photos, which will help with performance and longevity.Since the bearings fully came without lubrication, you can put your own and don't have to remove any. Use a sharp knife to carefully remove the rubber seal.2) Tolerances are okay. The bearing is definitely not rated any true ABEC, so that's just false marketing. At least these are not too pricey. For use in skateboarding (or rollerblading), non-ABEC rating is generally fine.3) Did not come with bearing spacers or speed washers. A lot of bearing kits for skateboards do come with spacers, but these did not. It's a minor inconvenience, but would be nice.4) No idea on longevity since I am not fully familiar with this brand. I am hoping the ceramic balls are fully ceramic and not coated like some manufacturers do. I have about 30 miles on these bearings and have hit speeds of 34 mph without any issues. I will check them after a few hundred miles and provide an update.Overall given the price and what I had to say, these bearings are quite good.

like these quiet and smooth use them in my chain rollers on my old CR250. these are the standard bearings used in almost all Chain rollers and can be replaced and lubed up easy. especially if you get one of those lifetime rollers.

Arrived on time as promised.... the bearings were too small for the purpose to fix the item I wanted for.. but I will keep it for further use.. It was not your fault it is the way I ordered.... Thank you

I had used this for months and there is no problem ever occurs. Relaible and work like charm. I would recommend this little bearing for all my friends.