Skateboard Bearings Set 2 Service-able Rubber Seals Set of 8 skateboard bearings, the set has 8 Deep Groove Radial Ball Bearings,skateboard bearings are closed with removable rubber seals,skateboard bearings are made of Chrome Steel,each skateboard bearings has 2 rubber seals to protect the rolling elements from dust or any possible contamination,also our skateboard bearings are pre-lubricated with oil, our skateboard Bearings set is packed 8 bearings in a high density bag.