6900-2RS Sealed Ball Bearing 10mm x 22mm x 6mm One Bearing 6900-2RS Minature Ball Bearing, 6900-2RS bearing is made of Chrome Steel,6900-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 6900-2RS bearing is self lubricated bearing,6900-2RS bearing is already greased.