Invisible zippers is a very good sewing craft kit for beginners. It is very easy to install and use. just to sew it on your clothes, also you can choose the suitable part of your to install it. Our coil zipper is made of high-quality nylon with alloy metal slider pulls, durable, colorfast, Lead-free,non-separating close-end colored zippers. Easy to sew zippers by hand or sewing machine. These nylon polyester zippers performed good even open and close frequently. Suit for making or fixing slacks, skirts and dresses, bags, pet clothes, pouches, and other craft projects. Also great for costume designing, clothing, boutique accessories, costume decorating etc.