S6904-2RS Hybrid Ceramic Ball Bearing 20x37x9mm Rubber SealedS6904 2RS Sealed Ball Bearing 20x37x9 mm Hybrid Ceramic Balls 20mm x 37mm x 9mm S6904 2RS is double sealed, radial and deep groove ball bearing, S6904 2RS bearing is made from stainless steel with Ceramic Balls, S6904 2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, S6904 2RS bearing is sealed and self lubricated, the quality is set to ensure high speeds, S6904 2RS bearing is lubricated with