18-inch Chunky Zipper is available in 9 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. It features a separating zipper and is ideal for clothing and accessories. Separating zippers allow the two sides of the tape are able to come apart completely after you install your zipper. This #8 molded plastic zipper features thicker teeth for heavy-duty applications. Use them on sweatshirts, backpacks, workout gear, and more.