18" Zipper YKK #3 Thin Nylon-coil Separating ~ Formal Wear ~ 918 Royal Blue (1 Zipper) 18" Zipper YKK #3 Thin Nylon-coil Separating Formal Wear ~ 918 Royal Blue (1 Zipper) YKK's perfect separating light weight zipper for Bridal and Formal Wear.