608zz Bearings: Single row bearing to support radial and axial loads. Shields on both sides keep lubricant out and contaminants out. Durability and resistance to deformation under heavy loads. 34,000 rpm limit with grease lubrication. It is suitable for skateboards, inline skates, scooters and other skating applications. The bearings are lubricated for smoothness. Item: 608-ZZ Ball Bearing Type: Deep Groove Ball Bearing Lubrication: Closures: 2 Shield, cannot be removed and reinstalled Color: Silver Material: Carbon Steel Size: 8mm x 22mm x 7mm Package Contents: 50 * pcs 608zz Ball Bearings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.