2.0 inches wide x 165 feet (55 yards). 2.0 mil foil and 2.0 mil backing. Performs from -20 F to 220+ F. Ensure that surface is clean, dry, free of grease, oil or other contaminants before applying aluminum tape High-quality aluminum foil coated in epoxy resin with strong, cold-weather solvent acrylic adhesive set on a easy-release silicone paper liner to preserve the adhesive and provide ease of use Ideal for an array of uses, including general repair, sealing hot and cold air ducts (excellent HVAC tape), duct insulation systems, sealing aluminum, stainless and plastic seams / joints, temporary repair of metal surfaces, copper pipe fixing, etc. Resists flame, moisture / vapor, UV degradation, odor, weather, some chemicals and smoke transmission. Good for both indoor and outdoor use. Chemically resistant, thermally conductive (helping cooling/heating efficiency), heat and light reflective Aluminum foil tape provides a durable bond at low and high temperatures. Conformable backing and pressure sensitive adhesive means it will adhere properly to a variety of smooth and irregular surfaces