The Greenlite Window Insulation Crystal Clear Shrink Film Kit Lot includes 4 packs of 3 shrink film sheets, totaling 12 units. These crystal clear film sheets are designed to provide insulation for any room in the house. Made of shrink film material, each sheet measures 62" in length and 42" in width. The solid clear color and shrink film style make it easy to apply to any window. The Greenlite brand ensures quality, and the kit is perfect for DIY home improvement projects.