K2 Sports Hero 50 Inline Skates (Grey/Blue/Black) Adjustability up to five full sizes means kids won't outgrow a K2 adjustable skate This frame is designed to absorb road vibration and lower the skaters center of gravity for a smooth, controlled ride. Designed to build confidence in new skaters. 72 mm/80a dureometer wheels with ABEC 3 bearings for smooth, comfortable ride Easy-pull lace system with locking buckle and pushbutton adjustment