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! 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. This hybrid ceramic version features Ceramic and Titanium coated balls. This combination of Ceramic and Titanium Coated balls allows for one of the lowest friction ratios possible. Lower friction means cooler running and longer lubricant service life. With this bearing you get the precision of ceramic and the durability of steel balls. The Ceramic ball cleans debris and cools friction allowing for a longer lasting bearing. Includes 8 8mm Bearings with integrated washers and 4 snap in spacers.