Illuminating Wheels: Light-up wheels powered automatically during movement. * Wheel Specs: 70mm, 82A polyurethane (PU) wheels. Size 7 to 9 * Bearings: ABEC-7 high-quality precision bearings. * Frame: Durable aluminum alloy frame. * Triple Closure Protection System: * Top fixing buckle * Hook-and-loop velcro strap * Reinforced standard shoelaces * Adjustable Sizing: Push-button size adjustment system on the side of the shell.