The outer tire is made of polyurethane material, which has good elasticity, wear resistance and no slipping. The wheel hub is made of high-quality material, CNC processed, light in weight and strong in load-bearing capacity. With high carbon steel bearings, long service life Suitable for professional scooters Fits more: 24mm wide is suitable for any scooter that currently runs 100mm wheels, such as kick scooter, pro scooter and many other freestyle scooters Product Name: Pro Scooter Wheels Size: . Diameter: 100mm/3.9inch Inner diameter: 8mm/0.87inch Thick: 24mm/0.31inch Bearing inner diameter: 8mm/0.31inch Color: Blue Weight: about 240g Color: Blue Material: Polyurethane + Aluminum Package Contents: 2 * scooter wheels Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.