3M 2145C Indoor Insulator Film Mounting Tape The half-inch in tape width makes it easy to apply around window frames and casingsThe tape is easy to apply and has a ready-to-peel linerCreates a strong bond between the surface, tape and film, securing an air tight sealShrinks tight for wrinkle-free, clear-as-glass resultsIncreases R-value by 90% over an average single pane window. Need more information on this product? Click here to ask.