6801-2RS Sealed Ball Bearing 12 x 21 x 5 mm One Bearing 6801-2RSSealed Ball Bearing is double sealed, radial and deep groove ball bearing,6801-2RS 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,6801-2RS is sealed and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,6801-2RS bearing is lubricated with greased.