S608-2RS Sealed Ball Bearing 8mm x 22mm x 7mm S608-2RS sealed, radial and deep groove ball bearing,S608-2RS bearing is made of Stainless Steel with Si3N4 Ceramic (Silicon Nitride) balls,S608-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination. It'sABEC-5 quality to ensure high speed.