Skateboard 608-2RS Ball Bearings 10 Ball Bearings 10 Ball Bearings 608-2RS, each bearing has 2 rubber seals to protect the bearing from dust or any possible contamination, the rubber seals can be removed and re-inserted again after greasing, these are self lubricated bearings (bearings are already lubricated with oil), seals can be easily removed for oiling, and of course can be re-installed again.Bearings are made from Chrome Steel.