ZAGG InvisibleShield Glass Screen Protector for HTC One M9 Protective: Made of fortified tempered glass, it delivers unprecedented scratch protection. Crystal Clear: High-grade tempered glass provides ultimate clarity. Guaranteed: Invisible Shield Glass is so good, it comes with a lifetime guarantee. Sensitive: At only 0.4mm thin, Glass offers ultimate touchscreen sensitivity. Ultra-Smooth: Its highly polished surface and tapered edges feel great and prevent snags when sliding devices in and out of pockets. Clean and Simple: Its oil-resistant coating repels natural skin oils making Glass simple to keep clean and looking great.