Set of red, blue, and white plastic zippers, perfect for crafts and sewing. - Colors: Red, Blue, White - Zipper Type: Plastic Zipper - Length: Red/Blue 53cm (double zipper) White 33cm (open-end zipper) - Uses: Crafts, Sewing The zipper tape (edge) is stretchy. I'm not entirely sure, but I think it might be a zipper for knit fabrics. I purchased these and have kept them stored at home without using them. Thank you for looking.