2 mil thick aluminum alloy foil with a pressure-sensitive synthetic rubber adhesive and paper liner. The aggressive rubber adhesive sticks well to most surfaces and the paper liner makes for convenient and reliable use. Great for shielding small areas, or wrapping cable. 1.89 inches wide and highly conformable, total thickness is only 3.6 mil. Can be used under all weather conditions. Resists water vapor, odor and smoke transmission. Application/use temperature range: +10°F to +180°F. Each roll is 30 feet long.