8 Skateboard Ceramic Bearing Sealed ZrO2Steel Roller Hockey Ball Bearings ZrO2 CERAMIC Balls Chrome Steel 8 Skateboard Bearings, 608 Steel ball bearings are 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
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