COMPATIBILITY: Specifically designed for Hero 4 Silver, both screen and lens, made of real glass of 0.33mm thickness, which can effectively protect your Hero 4 from external scratches. 9H HARDNESS: Made of high hardness material, after tempered steel processing, the hardness of surface up to 9H, which provides daily protection to against scratches and reduce the damage of your screen. WATER-PROOF: This screen protectors can effectively protects the screen from water, scratches, dust, oil, and it is fingerprints resist. Multi functions in one. HIGH DEFINITION: Made of optical glass material, which achieves more than 99% of transmittance, higher than plastic screen protectors. Exceptionally clear & low reflection. HIGH SENSITIVITY: The film is coated on the back with a strong silicone adhesive which makes it firmly attach to the screen and won't reduce the sensitivity of touching.