20-inch Jacket Zipper is available in 11 colors! The listed zipper length is determined by the length of the top stop to the bottom pin and box. The tape extension is not considered in the measurement. Separating zippers are designed so the two sides of the tape are able to come apart completely after the zipper has been installed. These Jacket Zippers feature a polyester coil with separating bottom pin and box. Ideal for clothes and accessories. Use them on jackets, sweatshirts, and more.