PlayWheels Dora Adjustable Quad Skate Size 1-4 Boot is made of hi-impact resistant polymer plastic with "Auto-adjust" system that allows the skate to "grow" with the foot, the boot easily adjusts to 4 different sizes with just the push of a button The Chassis is impact-resistant plastic polymer Wheels are PVC 54mm X 32 mm, bearings are 608zb speed bearings Dual toe brakes and safety straps Youth size 1-4