Precision 608 RS ABEC 11 Bearings for Scooters,Longboards and Skateboards (Pack of 10 PCS) (Red-Black)

These are smooth. Bought them to replace the ones in my grandson’s brand new skateboard. Made a world of difference.

Beautiful bearings. If you have any idea about how to maintain a tight set, these are perfect!Just pop’em, graphite’em and fligh on’em!So far I’ve just stuck them in a 20yo K2 kickboard Kick-Two and they’re outstanding.

Awesome and fast got faster when I broke them in. I use them on my poly wheels and just coast don't have to pump as much

It's a good thing they give you 10 because you're going to need to replace at least one after your first session. They come without any lubrication which gives some people the impression they're "fast" because they free spin well. Once you put a load on them, however, they aren't great. Beyond that, the lack of lubrication means if you so much as roll over some wet leaves you're at risk of rusting them out within hours. The rubber shields fit pretty well but there's still some play so moisture can definitely get in. Lubricating these will make them slightly better and they might last slightly longer, but even after that I had two that were more or less shot after my first session. Broke them down, popped the cages, cleaned everything with 90% iso, and it didn't really make a difference. I'm assuming the races or balls are probably not polished very well, and even the slightest bit of debris making it past the shield is going to compound the issue. I've replaced them with the two spares but I'm not expecting this set to make it through the week. These might be good for fidget spinners or if you're a parent who wants to make sure their kid can't go fast, but for street skating they're not great.

If you like going slow get this. If you want to go fast get Reds.