Power Balance Black Collection Hologram Wristband Striking Colored Holograms Make a Statement! The signature Black Collection wristbands are sleek, stylish and crafted from 100% surgical grade silicone. Durable and made to last, the new wristbands come complete with two Power Balance holograms. Power Balance Black Collection Hologram Wristband features: Made with comfortable, durable 100% surgical grade silicone Wristband is completely waterproof Two holograms have cutting-edge, three-dimensional imaging Hologram design is based on Eastern philosophies related to energy Small (6.3") a Medium (7.5") a Large (8.1") Power Balance...Prepare. Perform.