The Keyboard guard for 15.4 Inch for new macbook pro is made of premium high quality silicone rubber material. This has a very simple installation, and it stays on keyboard directly without paste or cut unlike the universal keyboard which falls out every time. Maintains natural typing feel, soft on fingers. The intresting part is the guard is removable and washable. For hygienic working environment this is effectively to prevent germ spread. Just prevents the keys from general wear (keyboard guard) otherwise this will cause tear by everyday use.