RLS7ZZ Sealed Ball Bearing 7/8" x 2" x 9/16" inch One Bearing RLS7ZZ Bearing is double Shielded, radial and deep groove ball bearing,RLS7ZZ bearing is made of Chrome Steel with chrome steel balls and steel cage,bearing is closed with Metal Shields to protect the bearing from dust or any possible contamination,RLS7ZZ bearing is Shielded and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,RLS7ZZ bearing is lubricated with grease.