Brass Metal Zipper Open End consists of a fastener with a row of metal or plastic teeth on each of the two way zipper, used to connect the edges of the opening (such as the mouth of a garment or a bag), and a slider that pulls the two rows of teeth into an interlocking position to close the zipper roll; Nylon Coil Zipper is a chain used to attach to something (as an object to be lifted or dropped) to tighten, stabilize or guide the thing. Black Teeth Metal Zipper is composed of chain teeth, sliders, upper and lower stops (front and rear) or locking pieces. The fastener element is the key part, which directly determines the side pull strength of the zipper manufacturers.