The Amp Integra Bearing System works for Longboard Wheels ONLY! These Abec 7's have an integrated spacer and washer system for perfect bearing alignment. Our team riders have been hitting more podiums than ever with these new Amp Integra Bearings! Engineered with zirconium oxide ceramic balls. Gas washed surfaces provide a lower coefficient of friction, resulting in a longer roll out. The T-profile spacer maximized contact surface area. This is the only bearing on the market that includes a snap in spacer system and built in washers. These bearings have ceramic balls white are harder, lighter than steel, stronger, and roll with less friction. This means you'll get going fast quicker and you will have a higher top speed. You won't need to replace your bearings as often due to flat spotting of soft metal balls degrading raceways on the inside of the bearing. Includes 8 8mm Bearings with integrated washers and 4 snap in spacers.