Zipperstop Wholesale Ykk&reg; Zipper 8" Zipper YKK #3 Skirt & Dress ~ 580 Black (12 Zippers / Pack) Zipperstop Wholesale Ykk Zipper 8" Zipper YKK #3 Skirt & Dress ~ Black (12 Zippers / Pack) Black #580 Strong yet lightweight zipper for slacks, skirts and dresses. These are nylon zippers with plastic teeth and a metal slider. Overall length is 9.5", actual zipper part measures 8"