Features Made of stainless steel, it has uniform hardness and good corrosion resistance, and it has strong applicability. The bearing can provide high rotation speed, and more quiet and stable during operation. The bearing is compact and stable, able to withstand larger loads and effective support. The bearing has high temperature resistance and double shielding to avoid the entry of pollutants and save lubricant. Wide range of applications, used in conjunction with skateboards, longboards, inline skates, roller skates, and electric skateboards. Specification: Item Type: Ball Bearings Material: Stainless steel Model: S607Z Product Size: Approx. 7x19x6mm / 0.28x0.75x0.24in(Inner Diameter x Outer Diameter x Height) Package List: 10 x Ball Bearings Package List 10 x Ball Bearings