Designed in Australia and tested to meet or exceed U.S. Department of Defense Standard 810F/G durability tests, the Dux works seamlessly with your new Surface its Type Cover and pen. Tough, reinforced TPU and polycarbonate construction protects from inadvertent drops. Slim and lightweight design yet super protective. New Infinity Hinge stand allows for almost limitless viewing and typing angles. Rubberized feet prevent the device from sliding on a smooth surface. Easy installation or removal of the device without the need for any tools. With built in pen storage and clear back panel for asset tagging or a custom look, your Surface Pro 4 never had it so good!