6306-2RS Sealed Ball Bearing 30mm x 72mm x 19mm 6306-2RS Sealed Ball Bearing is radial, deep groove ball bearing,6306-2RS bearing is made of Chrome Steel with chrome steel balls and steel cage, bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,6306-2RS bearing is sealed and self lubricated,the quality is set to EMQ (electric motor quality),6306-2RS bearing is lubricated with grease.