Skillbuilders¯ Bi Height Wedge 22 x 26 Height: 6 or 8 Electrodes Accessories Dynamic stretch strap is made Color:Yellow Dynamic stretch strap is made with elastic pockets that allow the user to ease into a stretch * Permits dynamic stretching * Designed for facilitated stretching an active form of stretching that uses isometric contractions to achieve greater flexibility gains that static stretching * Reduces the need for a stretching partner * Lightweight combination diaphragm bell chest piece for wide frequency response Position at a higher or lower height (use on side 1 or side 2) * Without the removable straps the deluxe wedge functions just like the standard Skillbuilders© wedge *