Cranium Hard Screen Protector/Whiteboard for 11.6" Acer C720 C720p C740 Chromebook Laptop Made from a PVC/aluminum blend that provides rigidity and strength to protect your Acer C720, C720P, or C740 Chromebook's screen. An exact-fit, permanent solution that weighs less than 8 ounces, yet protects your Chromebook's extremely flexible screen, making it virtually impossible to bend. The all-white Cranium doubles as a whiteboard, perfect for student-use in the classroom or for jotting down a note when you are on the run. Designed by a teacher for real-life, school or business use. Inexpensive added security that will protect your investment.