General Spec Material non-slip thermoplastic Function water proof and dust proof; protect your laptop keyboard against everyday harzardous element that may get in between the keys like dust food particles, insects and liquid. Compatibility 13.3" 15.4" 17" MacBook Pro Features A new concept to keep 13.3", 15.4" and 17" new MacBook Pro keyboard safe. Provide ultra comfortable feeling for your typing. Diminish the sound of keyboard when you type. Provent keyboard’s keys from general wear and tear caused by everyday use, washable and easy to remove.