Bearings come in a pack of 8 bearings.
For a bearing with a revolutionary shieldless design these bearings have a rather long list of features. Being that there isn't a shield you don't have to worry about road junk and dust getting caught in the grooves where the shield normally resided.
The races are tungsten coated which makes the fast, slick, and non-stick so you don't have to worry about dirt collecting there.
The shieldless design also enhances the sound of the bearing. You can hear these guys howl the faster you go.
The bearing cage is made of super strong, durable, non-distortion fiberglass filled pure nylon. This keeps the ball bearings evenly spaced and offer a little bit of protection as there is no longer a shield there to do the job for them.