30" Medium Weight Jacket Zipper YKK #5 Brass ~ Separating ~ 918 Royal Blue (1 Zipper/pack) 30" Medium Weight Jacket Zipper YKK #5 Brass Separating ~ 918 Royal Blue (1 Zipper/pack) YKK brass separating zippers are made from the highest quality metal. Brass teeth and Brass Auto-Lock slider. Highest quality zipper for a medium weight jacket or coat.