Feature:1. The ball bearing has a compact structure, good stability during operation, provide more effective support.2. It can be used in conjunction with skateboards, longboards, inline skates, roller skates, and electric skateboards.3. These bearings can provide quiet rotation and high rotation speed for the skateboards with good stability.4. Ball bearings have uniform hardness, high temperature resistance and double shielding to avoid the entry of contaminants and save lubricants.5. Made of stainless steel, it is rustproof and wearresistant, which can increase the service life of the bearing.Specification:Item Type: Ball BearingsMaterial: Stainless steelModel: S608ZProduct Size: Approx. 8x22x7mm / 0.31x0.87x0.28in(Inner Diameter x Outer Diameter x Height).Package List:10 x Ball Bearings