Acase Screen Protector Film Clear (Invisible) for iPhone 4 4S AT&T and Verizon and Sprint (3 Pack Front + 3 Bonus Back Films) Heavy duty screen protector, 100% guarantee no bubble Contents: AcaseView Films (3-pack), 3 Films for the Back, Application card, Micro-Fiber Cleaning Cloth. Retail packaging. It reduces glare, scratches, and smudges and improves clarity Non-adhesive backing, will not leave sticky residue Material: 3-layer PET film from Japan. Invisible film - once applied, it protectors your screen and it's invisible, almost as if it's not even there. The film is re-usable, simply clean with a moist cloth and re-apply to the device.