RMS7ZZ Sealed Ball Bearing 7/8" x 2 1/4" x 11/16" inch One Bearing RMS7ZZ Sealed Ball Bearing is double Shielded, radial and deep groove ball bearing,RMS7ZZ 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,RMS7ZZ is Shielded and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,RMS7ZZ is lubricated with grease.