RMS8-2RS Sealed Ball Bearing 1" x 2 1/2" x 3/4" inch one Bearing RMS8-2RS Sealed Ball Bearing is double sealed, radial and deep groove ball bearing,RMS8-2RS 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,RMS8-2RS bearing is sealed and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,RMS8-2RS is lubricated with grease.