6910-2RS Ball Bearing 50mm x 72mm x 12mm bearing 6910-2RS Ball Bearing 6910-2RS, the 6910-2RS bearings are made of Chrome Steel, 6910-2RS bearing has Rubber seals to protect the bearing from dust or any possible contamination, 6910-2RS bearings are self lubricated bearings, 6910-2RS bearings are already greased, the 6910-2RS bearings can rotate up to 5,000 RPM