12 x 22 x 5 Sealed Ball Bearing One Ball Bearing 12 x 22 x 5 Sealed Ball Bearing, Bearing is radial and deep groove ball bearing, 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, bearing is sealed and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed, bearing is lubricated with greased.