4" Zipper YKK #3 Skirt & Dress ~ Black (12 Zippers / Pack) 4" 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- 5.5" (14 cm) actual zipper length- 4" (10 cm)