Metal Zippers are the oldest type of zipper and are commonly found in purses, jeans, and trousers. They are suitable for applications with thicker fabrics. The listed zipper length is determined by the length of the top stop to the bottom stop. The tape extension is not considered in the measurement. Both styles featured are non-separating metal tooth zippers. Jean Zippers are Size 5 zippers and Trouser Zippers are Size 3 zippers.