Stretchy, durable, and effective: Power Balance Silicone Wristbands are crafted from 100% surgical grade silicone that stretches over your hand for a great fit, all while improving your overall balance with exclusive holographic, electro-magnetic field manipulation technology! Whether you surf, skate, or pound the b-ball court, the Power Balance Silicone Wristband will keep you off the ground and in the game.