Size: 20.5 - 22.0 inches (52 - 56 cm); Weight: 9.5 oz (280 g); Passes the SG/Product Safety Standards; Recommended for elementary school students and up; Includes a dial-type buckle that can be adjusted to fit the growth of growth; Lightweight model that is gentle for children - Use: bicycle kick scooters, roller skates, skates, inline skates, unicycles, etc.