Light weight cost effective thermal barrier mats. Constructed of a ¼" glass pad insulator compressed between a layer of high temperature aluminized and fiberglass cloth. This is designed to reflect radiant heat away from vital components. Easily fits to contours and bends, making it great for insulating floorboards and firewalls. Face aluminized side towards source of heat. Installation is easy with the included brass grommets; simply use a screw or rivet to mount. Custom sizes available.