OULII 50pcs 7-inch Nylon Invisible Zippers Tailor Sewer Craft for Sewing (Random Color) Color: Random color. Material: Durable soft nylon and plastic. Each zipper length: about 7-inch 18cm. Great for repairing and sewing crafts, costumes, clothing, etc. Invisible zipper to facilitate sewing projects. Simple and practical design and easy to use.