Metal Zipper One way zipper. Good performance in teeth strength. Ideal for shoes fasterner. 1.Material: Alumium, Copper, ... Availiable: 3#, 4#, 5#, 8#, 10#3.Teeth Style Available: Y Teeth, Stanadard Teeth.4.Teeth Color Available: Shinny Silver, Shinny Gold, Antique Brass ... customer's request.8. Green Material are available.9. Certificate of Quality: SGS, INTERTEX 5# Y Teeth One Way Zipper/Shoe zipper