The tempered glass is designed to protect the phone from knocks and scratches. With an industry-high 9H hardness (harder than a knife's blade), this protector is virtually impossible to scratch, whatever you whack against it. Precisely cut to cover the entire flat surface of your devices screen, keeping the earpiece speaker, camera, light sensor and home button totally unobstructed. Premium tempered glass makes this screen protector much smoother than the cheaper plastic alternatives. Fingers glide across just like your original glass screen and no visible finger prints are left behind.