roller skate wheels' durable processed rubber gives you just the right amounth of grip whether on a rink, street, or skate park. ENGINEERED TO AN perfectRIDE: These outdoor trick skate wheels reduce friction and maximize speed on various types of surfaces. These quad roller skate wheels work for casual outdoor skating, park skating, or doing technical dance tricks. INCREDIBLY RESPONSIVE TO YOU: The 64mm x24mm skate wheel has a rubber hub that makes it easier to perform technical skate tricks and maneuvers. HARD rubber FOR PRECISE TRICKS: These skate wheels are made from 97A hardness rubber and in a fun leopard pattern color that can match any set of skates. SMOOTH RIDE FOR OPTIMAL SKATING: These versatile skating wheels roll smoothly to help improve the comfort of your ride. colour: black Material: rubber size: 6.4cm * 2.4cm Package Contents: 4*Roller skate 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.