Wheelbone Practice Strap Wheelbone fits quickly and simply over the wheels of a conventional skateboard, providing a robust, non-slip grip that stops the heels from rolling. Wheelbone is made from ultra strong yet lightweight polyurethane. The Wheelbone is portable and easy to take down the skatepark to practice new tricks mid-session - or even in the comfort of your own living room The Wheelbone will stretch increasing in tension. This elastic tension in the polyurethane will be released during the ollie, resulting in an increase in pop that helps propel the board off the ground. When landing a trick, the polyurethane will re-tighten, absorbing the shock of impact With the normal rolling function of the wheels and the slide of the trucks impaired, the skater is given greater opportunity to maintain balance, control and poise on the board