16 inline Skate Bearings 608-2RS BRONZE Cage 16 skate bearings 608-2RS are Sealed Deep Groove Oil Preserved Radial Ball Bearings with BRONZE cage, The Bronze material is one of the least friction and less friction means higher speeds. Bearings have Rubber Seals, Bearings are made of Chrome Steel, each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with Oil.