The ZAGG InvisibleShield Glass XTR4 Screen Protector for Apple Watch is ZAGG’s strongest screen protection. It’s fortified with graphene—one of the strongest materials on earth—and has a rugged aluminum frame for added strength and style. XTR4 also features advanced blue light filtration, anti-reflective technology, and a dust-free installation process for maximum screen protection and visual comfort. Strong, Advanced Protection Tested up to 11X stronger than traditional glass screen protection. Fortified with Graphene Graphene is one of the strongest materials in the world, providing superior durability and strength. Improve Eye Comfort and Sleep Filters out blue light with Radiance Protection Factor 60 technology to improve eye comfort and sleep. Enhances Colour Vibrancy Anti-reflective technology increases transmitted light to improve screen clarity and enrich colours for deeper blacks, true blues, and more vibrant reds. Enhanced Scratch Protection XTR4 has a nano-infused surface that makes it incredibly hard and scratch-resistant. Maximum Touch Sensitivity XTR4 has an SiO2-enhanced coating for maximum touch sensitivity and a super smooth surface for fast, frictionless swiping. Made with Recycled Materials Made with up to 30% post-consumer recycled glass. EZ Apply® Installation The installation tray, made from 100% post-consumer recycled materials, ensures precise alignment.