Bella 9507A Keyboard Skin for Adobe Photoshop Extended CS5 The Bella Keyboard Shortcut Skins are compatible with PCs as well as Mac systems. By using the Apple Wireless Keyboard, you can use the Bella Skin with your favorite PC applications as well, simply by pairing the Bluetooth keyboard with your PC - the keys are marked for both Mac & PC use Made of thermoplastic polyurethane material that is just .25mm thick - about half the thickness of silicone keyboard skins - making the skin barely noticeable when using your keyboard The skin protects the keyboard from dirt and moisture