6301-2RS Sealed Ball Bearing 12 x 37 x 12 mm 6301-2RS Sealed Ball Bearing is radial and deep groove ball bearing, bearing is made of Chrome Steel with chrome steel balls and steel cage,6301-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,6301-2RS bearing is sealed and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,6301-2RS bearing is lubricated with grease.