S6903-2RS Hybrid Ceramic Ball Bearing 17x30x7mm Rubber Sealed BearingS6903 2RS Rubber Sealed Ball Bearing Ceramic Balls One Bearing 17mm x 30mm x 7mm S6903 2RS Sealed Ball Bearing is double sealed, radial and deep groove ball bearing, bearing is made from stainless steel with Ceramic Balls and Stainless steel cage, S6903 2RS bearing is closed with 2 rubber seals to protect the bearing from dust or any possible contamination, bearing is sealed and self lubricated,the quality is set to ensure high speed, S6903 2RS