Feature:1. These bearings can provide quiet rotation and high rotation speed for the skateboard with good stability.2. Ball bearings have uniform hardness, high temperature resistance and double shielding to avoid the entry of contaminants and save lubricants.3. Made of stainless steel, it is rust-proof and wear-resistant, which can increase the service life of the bearing.4. The ball bearing has a compact structure, good stability during operation, and can provide a larger load.5. Often used in conjunction with skateboards, longboards, inline skates, roller skates, electric skateboards, etc.Specification:Item Type: Ball BearingsMaterial: Stainless steelModel: S629Z Size(Inner Diameter x Outer Diameter x Height): Approx. 9 x 26 x 8mm / 0.4 x 1 x 0.3in.Package List:10 x Ball Bearings