Skateboard Bearings S608-2RS Ball Bearing 8 Bearings 8x22x7 mm Sealed Bearings S608-2RS Bearing, categorized as low friction 8mm axle skate bearing,Bearings works in skateboards, longboards, inline skates, rollerblades and roller hockey, Bearings are double sealed, radial and deep groove ball bearings,S608-2RS bearings are made of Stainless Steel with Si3N4 Ceramic (Silicon Nitride) balls, S608-2RS bearing are closed with rubber seals to protect the bearing from dust or any possible contamination, Bearing areABEC-5 quality to ensure high speeds.