16 Inline Skate Bearings works with Roller Hockey Too 2 Removable Rubber Seals 16 Inline Skate bearings use in rollerblades, roller hockey and some quad roller skates, the bearings are Deep Groove Sealed and have 2 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.