Size - Diameter: 70mm, width: 24mm, diameter of bearing is 8mm. for most inline skates, casterboards, skateboard. Please make they are compatible with your inline skates before you purchase. Material - These inline skate wheels are made of high elastic and wear-resistant PU, which can absorb vibration and impacts better, and are less likely to crack. It can also provide an excellent grip so you can skate safely without worrying about slipping.Applications - for beginners, these skates wheels provide a smooth easy ride indoors or outdoors. Suitable for daily practice, entertainments, skating competion, artistic skatingPackage Includes - With eight replacement wheels, just in line with the needs of one pair of roller shoes, extremely meets your needs.High-tech elastic material makes movements easy and noiseless. ly suitable for indoor daily practice, recreational skating, extremely handy and practical.Colour: BlackMaterial: PU + MetalPackage Contents:8*Inline Skates WheelsOnly the above package content, other products are not included.Note: Light 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.