Applied in shock absorption design, the zipper teeth are closely lined up together, and the teeth’s surface is even and smooth, so it is easy to pull the zipper; Sewing zippers are made of Material, long lasting polyester tape and automatic lock slider, durable and reliable; EASY TO USE - It is very easy to install and use for a beginner. What you need to is just to sewing it on your clothes, and you can choose the suitable part of your to install it; Extensive use: Can be sewed in ’s dresses, jackets, pillows, backpack, tent, sleeping bag, school bags, sofa cover; also can be decorated as colorful ornaments for products; Easy to install and replace, practical sewing accessories for household and manual production use