EMPIRE Premium Tempered GLASS Screen Protector for Apple iPhone 4 / 4S Specially designed tempered GLASS screen protector for Apple iPhone 4 / 4S. Oleophobic coating helps reduce visability of fingerprints and other contaminants, making it easy to quickly clean the screen. Made from high light transmission materials which helps reduce glare and increase sharpness, the tempered glass is only 0.4mm thick. Back is coated with a strong silicon adhesive, making installation easy and ensuring it firmly gets attached to the screen. EMPIRE is a registered trademark with the USPTO.