Bubble-Free Installation The installation kit is very complete to help installation without any problems, installation guide, tools (cleaning wipes, anti-dust adhesives, and especially a guide frame). The alignment frame is designed to well position the glass, greatly facilitates the installation of the protective glass on the iPhone. Superior Shock Resistance Hardness index up to 9H technology design offers powerful protection to the screen of your iPhone. No more worries about breaking the screen caused by accidental falls. High Definition & Sensitivity 99% clear transparency for high definition display. Does not interfere with the use of touch screen and 3D touch.