Advanced optical material is used to ensure you get the highest visibility on your screen. Same virtually indestructible film used by the military to protect aircraft surfaces! Installation is done by "wet application" which allows you to re-position the film as many times on the surface unlike typical screen protectors film from your screen leaves no sticky residue. Bubble Free and Anti-Yellowing - Advanced polymer adhesive is used to prevent the forming of air bubbles and discoloration.