1) Zipper closing styles Closed end, separator (open end), 2-way separator, interchangeable, back to back 8-type, back to back X-type, head to head 0-type, bridge top, continuous loop. 2) Zipper materials, sizes and teeth finishes We offer zippers in three different types metal, Delrin, polyester coil and diamond. One of these will suit almost any application or need. Each type comes in a range of sizes and finishes. 3) Sliders The application of the zipper determines the slider design which should be used. Sliders are made from zinc or brass and plated or enameled to fit any design need. 4) Locking functions Non-lock, auto-lock, semi-lock, double pull, reversible wing-lock, reversible auto-lock.