17" Vislon Zipper ~ YKK #5 Molded Plastic Sport Zipper ~ Separating - 578 Medium Grey (1 Zipper / Pack) 17" Vislon Zipper ~ YKK #5 Molded Plastic ~ Separating - 578 Medium Grey (1 Zippers / Pack) Made from the finest quality plastic to ensure extra strength & reliability. Very popular for active wear and outerwear. Great for ski jackets.