[DURABLE CONSTRUCTION] Made of metal, easy to dissipate heat, and allows for flexible rotation with long-lasting durability. [SMOOTH MOTION] Features an axle and extra side plug to secure the bearings, helping reduce drag and ensure smoother performance, while supporting bearing stability. [EASY TO INSTALL] The recessed design fits precisely between bearings, providing seamless integration with wheels for reliable support; compatible with standard male and female skate axles. [COMPATIBILITY & SIZE] Axle diameter: 6mm, bearing inner diameter: 6mm, wheel inner diameter: 8mm. Suitable for most roller skates using 6mm axles. Please check the product specifications and measure your wheels to ensure proper fit. Style: A Color: Silver Material: Metal Package Contents: 10 x Axle 2 x Wrenches 16 x Side Plugs 8 x Three-Section Aluminum Casing 10 x Screws Note: Light and display settings may cause slight color variations. Measurement error: +/- 1-3 cm. Only the above items are included.