"Zip Up Zipper is a peel and stick adhesive zipper system that creates easy access into tarp or poly enclosures. It is easy to install and opens from either side. The zipper is great for creating an instant doorway for an enclosed growing space or greenhouse. Each zipper is 3"" x 7' with two end pieces and two Velcro tabs. The Zip Up is great for containing dust, moisture, and pests."