K2 Skate Boy's Sk8 Hero Boa Inline Skates Original K2 Softboot This cuff offers the maximum amount of support that kids need, and provides the "easy-on, easy-off" Boa Closure System, a must-have on youth product Interlocking the frame and base creates a composite recreational frame that absorbs more road vibration then any other K2 frame Wheels/Bearings: 72mm, 80a/ABEC 3 No Pressure Points, fine tune fit at 20 miles per hour, "easy-on, easy-off" design