60/22-2RS, Bearings are made from Chrome Steel, 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: 60/22-2RS Ball Bearings Brand: NSK Made in Japan Type: Deep Groove Ball Bearings Size: 22mm x 44mm x 12mm Inner Diameter: 22mm Outer Diameter: 44mm Width: 12mm Closures: 2 Rubber Seals Quantity: 2 Bearings Dynamic load rating Cr: 9,400 N Static load rating Cor: 5,510 N Limiting Speed: Grease Lubrication: 17,000 RPM