6011RS Sealed Ball Bearing 55mm x 90mm x 18mm 6011RS Sealed Ball Bearing, 6011RS Bearing has Electric motor Quality, clearance is optimum to ensure higher speeds,6011RS bearing is made from Chrome Steel,bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,6011RS bearing is self lubricated bearings, 6011RS bearing is already greased.