"6011-2RS Ball Bearings High QualityBall Bearings 6011-2RS, bearings are made from Chrome Steel and can rotate up to 8400 rpm, each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, these are self lubricated bearings (bearings are already greased). * Item: 6011-2RS * Closures: 2 Rubber Seals * Quantity: 1 Bearing. * Bearing Dimensions: 55mm x 90mm x 18mm * MARKING: 6011RS"