CoverON Mirror LCD Screen Protector Shield for Nokia Lumia 521 This screen protector film offers complete front LCD screen protection while maintaining full touch screen sensitivity and operation Screen protector is constructed of 3 layers of PET Film. The actual screen protector is in the middle of two extra clear layers to keep it clean and easy to be applied Expect better quality than any other screen protector. It has a modified Silicone Coating LCD surface to protect your phone against dust, scratches, and waterproof Custom Designed to exact shape and dimensions of your phone; No cutting is required. Easy to apply and easily removable without leaving residue on your screen. Mirror Screen protectors work like a real reflective mirror when backlight off, will become invisible/transparent when backlight is on.