PackageZoom Shrink film or shrink wrap is plastic that is heat-sealed around an object or item being packaged. Once the item is loosely wrapped in shrink film, heat is applied all over the plastic from a heat gun or a heat tunnel. The plastic has additives that allow it to shrink when heat is applied, causing it to form a tight layer around the product to complete the wrapping process. Polyolefin shrink wrap film is a combination of polyethylene and polyethylene. It is more transparent and smoother than PVC shrink film. Polyolefin shrink wrap films are more commonly-used for packing products and are available in different forms, including low-temp and high-temp polyolefin. Centerfold shrink wrap films, the products are tucked in between the fold of the films, and then the edges are sealed. The PackageZoom centerfold shrink wrap film is meant for semi-automatic and manual shrink packaging. Technical Specification: 22 inch x 4375 Ft x 60 Gauge Shrink Film Wrap: Non-Crosslinked Type: Heat Activated Shrink Film. Material: Polyolefin Shrink Film Wrap. Style: Centerfold Heat Activated Shrink Wrap: Non-Crosslinked. Width: 22 inch Shrink Film. Roll Length: 4375 ft Shrink Film. Thickness: 60 Gauge Heat Shrink Wrap. Color: Clear. For Use With: Heat Guns Or Shrink Tunnels. INCLUDE: 1 Roll 4375 Ft Shrink Film. SAME DAY SHIPPING: Order must placed by 2PM EST.