S6800-2RS Sealed Ball Bearing ABEC-5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 10mm x 19mm x 5mm S6800-2RS Sealed Ball Bearing, S6800-2RS bearing is made of Stainless Steel with Ceramic Balls (Si3N4) and Stainless steel cage, S6800-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, S6800-2RS bearing is sealed and self lubricated, bearing inner diameter is 10mm, bearing outer diameter is 19mm and bearing width is 5mm, the quality is set to EMQ (ABEC-5 quality) to ensure high speed, S6800-2RS bearing is lubricated with grease.