Specam Tactical Zoom Reverse Door Scope Peep Hole Watcher Mono Telescope Door View Tactical Door-Viewer is made of high quality lightweight materials The housing is a strong, lightweight composite with an all-weather coating. The lenses are high-quality precision ground glass custom designed for Tactical Door-Viewer. Tactical Door-Viewer is designed to be carried by all types of officers. It is lightweight and easy to use. An officer can carry it on a web belt, vest or in a pocket.