This is from a family who ran a dressmaking school. I'm also selling many other items, such as beads and buttons. Various manufacturers, including YKK. Some types do not have the bottom stopper. Zippers have been tested and open/close smoothly. For those who want various sizes and colors. Also, these were materials owned by the school, so please purchase only if you are satisfied, as minor details may be of concern. Lengths are approximately: 15cm, 22cm, 27cm, 45cm, 50cm, and 58cm.