The Frost King® V73H Window Insulation Shrink Kit contains one sheet of film to insulate one standard size window helping increase the R-Value up to 90% for energy-saving efficiency. Helps keep out drafts and dust. Film shrinks crystal clear tight and wrinkle free with an ordinary hair dryer (not included). The shrink film can be easily installed on metal painted varnished wood or vinyl clad window frames with the double-face tape included.