This is a Frost King 4-Pack Indoor Window Insulation Shrink Kit. Provides a low-cost insulation and draft seal solution to save up to 35% of heat loss. Easily installs crystal clear with a standard hair dryer. Increases the R-value of single-pane windows by up to 90%. Includes four plastic film sheets, each 42 in wide x 62 in tall, and double-sided tape.