High Impact Screen Protector Tri Flex uses an intelligent three-layer design for the ultimate, flexible screen protector solution. Providing scratch and impact protection, Tri Flex offers easy application for all devices. Multi-Layer Protection Tri-Flex?s three-layer design is comprised of an Anti-Scratch, Anti-Shock and Silicone layer to protect your device. The Anti-Scratch layer is durable and scratch resistant, the Anti-Shock layer offers advanced impact protection whilst the Silicone layer ensures the screen protector adheres to your device bubble-free. 0. 4mm Thin Tri Flex has a 5H hardness rating and features a 0. 4mm ultra-thin, scratch and impact resistant design with high transparency. Anti-Yellowing Properties Anti-yellowing properties keep your screen protector looking clear and as good as new for longer. 2 Pack for Long Lasting Protection.