S6903-2RS Stainless Steel Sealed Ball Bearing 17mm x 30mm x 7mm S6903-2RS radial and deep groove ball bearing, bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, S6903-2RS bearings is sealed and self lubricated, S6903-2RS bearing is made of Stainless Steel, bearings is lubricated with grease.