608ZZ Shielded Ball Bearings, Bearings are made of Chrome Steel, each bearing are rubber sealed from both sides to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease. Item: 608ZZ Ball Bearings Type: Deep Groove Ball Bearings Closures: Metal Shields Lubrication: Self Lubricated (Grease) Size: 3mm x 9mm x 5mm Inner Diameter: 8mm Outer Diameter: 22mm Width: 7mm Quantity: 10 Bearings Dynamic load rating Cr: 430 N Static load rating Cor: 160 N Limiting Speed:Packing: 10 bearings in One plastic tube Grease Lubrication: 60,000 RPM