Kryptonics Quad Roller Skate Adjustable quad roller skates with easy-push button switches between 4 sizes to fit kids as they grow Safety buckles and easy-to-use straps keep skates snug and secure during play Dual toe brakes enables easy and safe slowing or stopping 54mm x 32mm PVC wheels make for a smooth and comfortable action sport Recommended for ages 5 through 8 years, supports weight up to 88 lbs.