ZAGG InvisibleShield Glass Screen Protector for Microsoft Surface Book Protective: Made of fortified tempered glass, it delivers unprecedented scratch protection. Crystal Clear: High-grade tempered glass provides ultimate clarity. 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. Easy Installation: Glass features a sleek adhesive layer that goes on quickly and cleanly. Simply align it, press it, and watch as Glass does the rest. Guaranteed: InvisibleShield Glass is so good, it comes with a lifetime guarantee.