materials-these inline wheels are made of highly elastic and wear-resistant PU, which can better absorb vibration and impact, and are not easy to break. It also provides excellent grip, so you can skate safely without worrying about slipping. Application-These roller skates are very suitable for beginners and can ride easily and smoothly indoors or outdoors. Suitable for daily practice, entertainment, skating competition, artistic skating High-tech elastic material makes movement easy and noiseless. Very suitable for indoor daily practice, casual skating, extremely convenient and practical. size:70x24mm Material:PU colour:Black Package Contents: 4 x 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.