Skateboard/Inline Skate 608-2RS Ball Bearing One Bearing This is a single 608-2RS Ball Bearing, each bearing has 2 rubber seals to protect the bearing from dust or any possible contamination, this is self lubricated bearings (bearing is already lubricated with oil), seals can be easily removed for future maintenance or lubrication, can be re-installed again.Bearing is made from Chrome Steel.