Reflect-A-Shield from Heatshield Products uses a 1/4" thick ceramic inner pad sandwiched between heavy duty foil and bound together with a stainless steel mesh at the edges. By sewing the edges as opposed to simply folding them, Heatshield Products create greater flexibility and a more rugged product. As with any aluminum insulation product, it is not designed for direct contact with exhaust systems. The shield withstands 1000° F continuous radiant heat and 400° F of direct contact. It is intended for wrapping around electrical boxes, air conditioning components, or used as a catalytic converter and muffler shield. All shields may be fastened with Thermal-Tie, safety wire, screws, or rivets.