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Description: A screen guard is an additional sheet of material—commonly polyurethane or glass—that can be attached to the screen of an electronic device and protect it against physical damage. Screen guards first entered the mobile-device market after the rise of personal digital assistants (PDAs). Since PDAs were often operated via a stylus,the tip of the stylus could scratch the sensitive LCD screen surface. Therefore, screen guards provided sacrificial protection from this damage. Since then, the ubiquity of mobile-devices have seen the screen guard become more widely used. Screen guards are made of either plastics, such as polyethylene terephthalate (PET) or thermoplastic polyurethane (TPU), or of tempered glass, similar to the device’s original screen they are meant to protect.