Perfect fit for the All the Latest Macbook Pro 13, 15, 17 with or w/out Retina Display Models: A1278 and A1425 Released June 2012 and October 2012, Wireless Keyboard and Macbook Air 13" * Design to provide the full protection for your keyboard against dirty, such as liquid spill and dust. * Compare to Silicone , TPU Material is much more thin and higher transparent. * Removable and washable, the free cleaning without affecting the effectiveness of their use * Mute-Typing, diminishes keystroke sound in libraries and conference room etc