S6803-2RS Ball Bearing ABEC-5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) Sealed Bearing S6803-2RS Bearing is double sealed, radial and deep groove ball bearing,bearing is made of Stainless Steel with Ceramic Balls (Si3N4) and Stainless steel cage,S6803-2RS 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 (ABEC-5 quality) to ensure high speed,S6803-2RS bearings is lubricated with grease.