1 You do not need to unsew the entire zipper. 2 You can replace a broken zipper slider immediately. 3 You can replace a zipper slider with the desired color. 4 You can replace a pull tab of the zipper slider with the desired design. 5 You can mount the zipper slider one more on the other side, so that you can open and close on both sides. You can use the zipper slider as a fashion item.