This is premium tempered glass protector which has excellent window display,  highly sensitivity and comfortable touch feeling. It is highly premium tempered glass with  an average mixture of water. Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. Such stresses cause the glass, when broken, to crumble into small granular chunks instead of splintering into jagged shards as plate glass (a.k.a. annealed glass) does. The granular chunks are less likely to cause injury. As a result of its safety and strength, tempered glass is used in a variety of demanding applications, including phone screen protector.Premium tempered glass is made with transparent glass that has undergone specialized treatment, with an industry leading hardness of 9H, just below diamond with a hardness of 10H. Provides super high definition clarity.