Metal Zipper: Metal Zipper (金属拉链)
A zipper with teeth stamped from brass, nickel silver or aluminium and clamped onto the tape. Metal teeth give a premium look and high strength, so they suit denim, leather goods and heavy bags. Surface plating provides colour and corrosion resistance. Quality depends on wire hardness, stamping accuracy, plating adhesion and tooth setting depth. Metal zippers are inspected for burrs and tested with salt spray.