8x22x11mm Bearing Shielded - Miniature8 x 22 x 11 Skateboard Sealed Ball Bearing 8 x 22 x 11 Skateboard Sealed Ball Bearing, bearing is Carbon Steel, 8 x 22 x 11 bearing has built in rubber seals in order to protect the moving elements from dust or any possible contamination, this is self lubricated bearings (bearing is already lubricated with oil), oil lubrication is to ensure fastest possible speeds. 8 x 22 x 11 Skateboard Bearing Deep Groove Ball Bearing Inner & Outer Races: Carbon