8 Skateboard Ceramic Black Bearing Sealed ZrO2 Outer Diameter - 4.921 inch (4.921") Dimensions: 1/4" x 1/2" x

Dimensions: 1/4" x 1/2" x 3/16" inch

and reduced rolling resistance

Equal Nachi 63102Z

bearing is Eccentic Locking Collar

each bearing has rubber seals to protect the bearings from dust or any possible contamination

8 Skateboard Ceramic Black Bearing Sealed ZrO2 Outer Diameter - 4.921 inch (4.921") Dimensions: 1/4" x 1/2" xSet of 8 Skateboard Black Ball Bearings with Ceramic Balls Skateboard ceramic black bearings set. The set has 8 Bearings 608 Steel ball bearings with high speed solid Ceramic Balls (not painted or filled with Ceramic Material), bearings have high speed ball retainer, inside them there are Zirconia fibers 7 Ceramic balls, with one non contact white rubber seal, inner and outer races are made from high strength Steel, 7 balls are made from high strength