FixnZip Black Nickel Replacement Zipper for Sewing, Medium Replacement zipper slider FixnZip Medium fits zipper sizes 5-8 FixnZip works on plastic, metal and nylon zippers Most zippers fail because the slider is worn out or broken Replacement zipper slider FixnZip Medium fits zipper sizes 5-8 FixnZip works on plastic, metal and nylon zippers Most zippers fail because the slider is worn out or broken