The Luminous LED Inline Wheels create a whole new element of fun while skating, and the White Glow even has a glow-in-the-dark feature. LED lighted wheels can be seen any time of day, but really pop in the dark. Installs like any other wheel. LED lights function when used with an included spacer that fixates in the center of the wheel. All you need to do is enjoy the show! 85A hardness Luminous wheels are great for outdoor skating both recreationally and urban freestyle. Some of the wheels have a glow-in-the-dark feature. The wheels will work with 6mm axles however they will not have the light-up effect unless used on 8mm axles. The lights also have an average of 100+ hours of light time (experience may vary).