ZipperStop Wholesale YKK® 70cm Medium Weight Jacket Zipper YKK #5 Brass ~ Separating ~ 580 Black (1 Zipper/pack) YKK brass separating zippers are made from the highest quality metal. Thoroughly tested to ensure strength & reliability. Highest quality zipper for a medium Weight jacket or coat. Medium Weight YKK Zipper. Brass teeth and Brass Auto-Lock slider. Colour may vary on your monitor.