There are different types of zippers, so make sure you are buying the correct one for your project. Closed end zippers are for pants, skirts, handbags or pockets. Separating zippers are for jackets, sportswear or sleeping bags. Standard closed end and separating zippers have visible plastic or metal teeth and a metal or plastic zipper pull. Invisible zippers have hidden teeth and a smaller pull (usually used for women’s clothing). There are also zippers with larger teeth that are usually meant for outerwear or bags. If you’re just starting out it’s a good idea to use a plastic or nylon zipper so if you sew over it you probably won’t break your needle.