Aluminum Foil Tape 1.96 in x 43.7 yd, 1.5 mil HVAC Auto Rework Metal Repair Resists water vapor, odor and smoke transmission Combines the sealing and protective benefits of aluminum with the ease of use of tape Highly reflective reduces the impact of heat and light Ideal for sealing both cold and hot air ducts Can be used under all weather conditions; matches aluminum foil-faced duct systems and insulation; designed for maximum adhesion over clean, dry surfaces