Description: Skateboard bearing spacer is made of Aluminum alloy, durable, wear resistant Improve skateboard stability and reduce wheel shake, shock proof, Keep bearings parallel, improve rotating speed and precision, reduce bearing wear and tear Help you skateboard slide faster with less energy required, wheel will be in stable moving 10.5mm high, 10mm diameter, 1.35mm thick, tube shape, can be easily installed into your wheel bearings, good replacement hardware for repair or rebuilding kit Accessories for longboard, skateboard, cruiser, scooter, etc. Specification: Material: Aluminum Alloy Size (H x OD. x T): Approx. 10.5x10x1.35mm / 0.4x0.4x0.05inch Package Includes: 4 Pieces Skateboard Bearing Spacers Note: Please allow slight size deviation.