6011 LU Sealed Bearing 55x90x18mm6011LU Sealed Ball Bearing 55mm x 90mm x 18mm 6011LU Sealed Ball Bearing, 6011LU Bearing has Electric motor Quality, clearance is optimum to ensure higher speeds, 6011LU bearing is made from Chrome Steel,bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 6011LU bearing is self lubricated bearings, 6011LU bearing is already greased. item: 6011LU Ball Bearing Deep Groove Ball Bearing Closures: Rubber