16 Roller Hockey Ceramic Bearing Sealed

16 Skate Bearings 608 has high speed solid Ceramic Balls, every bearing has a Steel high speed ball retainer, inside them there are Zirconia fibers 7 Ceramic balls, with a non-contact rubber seal, inner and outer races are made from high-strength Steel, 7 balls are made from high-strength Ceramic Zirconia fibers, each bearing has 2 non-contact rubber seal to protect the bearing from dust or any possible contamination.