Luminous Light Up Quad Roller Skate Wheels with BankRoll Bearings Installed Features MATCH YOUR SKATES - 32mm x 58mm skates wheel come in various colors. White, red, blue, hardness 82A. FOR MILES OF USE - Luminous Light Up Quad Roller Skate roller skate wheels' durathane will give you long-lasting grip. This urethane performs great on wood, concrete and sport tile indoor surfaces. DESIGNED TO SPEED - These indoor performance skate wheels reduce friction and speed on various types of surfaces. These quad rollerskate wheels work for casual indoor skating or competitive skating. RIDE FOR OPTIMAL SKATING - These versatile skating wheels roll to help improve the comfort of your ride. INCREDIBLY RESPONSIVE TO YOU - skate wheel has a Spoke Hub that makes it easier to perform stops. This advanced hub offers excellent handling for speed skating. Note： The product does not contain batteries. By installing the bearing and magnetic core, the magnetic core and the coil inside the wick motion of cutting magnetic sensing line when the wheel rotates, thus generating electricity and lighting the LED inside the wheel to achieve luminous effect Package Contents: Light Up Quad Roller Skate Wheels ×1 Bearing ×2 core×1