YKK Conceal ~ Invisible Assortment of Colors 12" (12 Zippers/pack) Zipperstop Wholesale YKK YKK Conceal ~ Invisible Assortment of Colors 12" (12 Zippers/pack) The assortment will include the hottest colors of the season. The Nylon Coil Teeth are hidden on the reverse side of the tape Teardrop Slider Light, dark and bright colors.