Elevate your designs with a COSTUMAKERS 30 cm (12 in) one-way separating zipper in black. Featuring #5 metal teeth mounted on reinforced polyester tape, this medium weight closure delivers smooth operation, corrosion resistance, and consistent dye-lot colour. Precision-cut tape maintains exact width for hassle-free installation, while ergonomic pulls make opening and closing effortless. Perfect for sportwear, each production lot is tensile-strength and slider-fatigue tested to guarantee reliability in tough, real-world use. From small-batch prototypes to high-volume runs, makers rely on COSTUMAKERS for tight length tolerances, shade consistency, and hardware that stays functional season after season.