PP boot and chassis Push button size adjustment Quick lock buckles Toe stop brakes 54mm PU light up wheels ABEC-7 bearing Adjustable. These adjustable kids' rollerskates feature a PP boot and chassis for durability. They also include a convenient push-button size adjustment, quick-lock buckles, and toe-stop brakes for safety. The 54mm PU light-up wheels and ABEC-7 bearings provide a smooth and fun riding experience.