3M Indoor Window Insulator Kit, 5-Windows - Set of 2 (10 Windows) 2 Packages, Each package Insulates five 3' x 5' windows Each package Included: (1) 5.16' x 17.5' film sheet, (2) rolls of tape, 1/2" x 27.7 yd Lowers heating costs and saves energy Applies easily, shrinking tight, wrinkle-free and clear on glass Increasing the R-value of single pane window by 90%