627-2RS Sealed Ball Bearing ABEC-5 Quality with Ceramic Balls 7mm x 22mm x 7mm One Bearing 627-2RS Sealed Ball Bearing is categorized as thick section, double sealed, radial and deep groove ball bearing,627-2RS bearing is made of Chrome Steel with Ceramic Balls and Chrome steel cage,bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,627-2RS bearing is sealed and self lubricated,the quality is set to EMQ (ABEC-5 quality) to ensure high speed,627-2RS bearing is lubricated with Oil.