Features 1、Made of high grade carbon chromium steel 2、High speed, less noise, long service life 3、Shields on both sides of the bearing to keep contaminants out 4、Durability and resistance to deformity under heavy loads 5、Dimensions suitable for use in such applications as skateboards, inline skates, and scooters Specification Description: This bearing is a double shielded miniature ball bearing. It is built to support radial loads and made from carbon steel for durability and resistance to deformity under heavy loads. Bearings are suitable for use in such applications as skateboards, inline skates, and scooters and comes in a pack of 10. Features: Made of high grade carbon chromium steel. High speed, less noise, long service life. Shields on both sides of the bearing to keep contaminants out. Durability and resistance to deformity under heavy loads. Dimensions suitable for use in such applications as skateboards, inline skates, and scooters. Specifications: Material: Carbon chromium steel Model: 623ZZ Inner Diameter: 3mm / 0.11" Outer Diameter: 10mm / 0.39" Thickness: 4mm / 0.15" Quantity: 10 Total Weight: 18g(approx.) Package Includes: 10 x Bearings Package List