RT-KBS04 Silicone Keyboard Protector for the polycarbonate MacBook and MacBook Air. This is a premium custom-molded silicone keyboard cover, specifically fit to the keyboard layout of the white MacBook and MacBook Air. It rests over the keys, keeping out spills, dirt, bacteria, and other contaminants from getting onto or into the keyboard area. This helps keep your MacBook clean, since you can remove the protector for cleaning. Our silicone is thin and durable: at only 0.25 mm thick, it"s transparent and very soft, providing a clean look and excellent key response. This also allows it to be carried inside a closed MacBook, so you can protect your keyboard on the go. Customer service support information: Toll Free: 1-888-248-2019 Product specifications: Contents: Silicone Keyboard Protector for the white MacBook and MacBook Air 1 pc. Dimensions: Thickness: 0.25 mm (10 mil).