Usage Tips:Size - Diameter: 70mm, width: 24mm, diameter of bearing is 8mm. Perfect for most inline skates, casterboards, skateboard. Please make sure they are compatible with your inline skates before you purchase. High-quality Material - These inline skate wheels are made of high elastic and wear- 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 - Perfect for beginners, these skates wheels provide a smooth easy ride indoors or outdoors. Suitable for daily practice, entertainments, skating competion, artistic skating Package 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. Perfectly suitable for indoor daily practice, recreational skating, extremely handy and practical. Colour: Black Material: PU + Metal Package Contents:8*Inline Skates Wheels Only 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.