Master Plumber, 189 x 10 YD, 48 mm x 91 m, Foil Tape, Provides A Superior Water Vapor Barrier For Sealing Seaming Applications, Excellent Adhesion On Metal Box Ducts, Exchange Boxes Other High Temperature Fluctuation Applications, High Tack RubberBased Adhesive Forms Instant Bond To Metal, Plastic, Fiberglass Other Composite Surfaces, Heavy Duty Foil Backing Conforms To Curves Corners For A Tight Seal, Excellent Indoor Outdoor Performance