The Steinheil GLAS.t NANO SLIM for the Samsung Galaxy S4 is made to cover and protect the LCD from damage and scratches with specially processed transparent glass that has been reinforced for scratch resistance. The glass has been designed to have a slim thickness of 0.15mm. GLAS.t NANO SLIM is currently the thinnest glass screen protector in the market! The 0.15mm thickness makes the GLAS.t NANO SLIM compatible with all types of cases while still maintaining a surface hardness of 8~9H. When installed, there are no gaps between the LCD and the GLAS.t SLIM which means the touch screen"s sensitivity is unaffected.