7" Zipper YKK #3 Skirt & Dress ~ Black (12 Zippers / Pack) 7" 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- 8.5" (21.5 cm) actual zipper length- 7" (18 cm)