Master Plumber, 1.89" x 10 YD, 48 mm x 9.1 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 Rubber-Based 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.