Set of 8 608-2TS Skateboard Sealed Ball Bearings With Ceramic Balls 8mm x 22mm x 7mm Set of 8 608-2TS Skateboard sealed with ceramic Balls Ball Bearings, 608-2TS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 608-2TS bearing is sealed and self lubricated, 608-2TS bearing is lubricated with grease.