• Concealed zippers with nylon coils, polyester tape, and metal sliders; Lead-free; Non-separating closed end zippers; All-purpose; Durable and lightweight; Easy to sew zippers by hand or sewing machine; Colorfast and bleeding free; Fit for indoor or outdoor uses; • Invisible zippers for sewing, crafting, and fashion design; Great fabric zippers for pillow cases, cushion covers, pouches, purses, handbags, pants, skirts, dresses, costumes, and upholstery; • Bulk zippers: 40 pcs; Color: Black • Hidden zippers for sewing with consistent color and quality; Teeth width: 4 mm; Size 3; Overall width: 0.85 in;