The zipper is composed of chain teeth, pullers, limit codes (front and back codes), or locking components. The chain teeth are closed
The key part directly determines the side pull strength of the zipper. Generally, a zipper has two chain straps, each with a row of teeth arranged in a staggered manner. By gripping the chain teeth on both sides with the pull head and sliding with the help of the pull loop, the chain teeth on both sides can be engaged or disengaged from each other.