This cord is made from high quality spandex material. It is thin enough for comfort, yet durable enough to maintain its hold. Cut and sew DIY projects like costumes, masks, or to replace a drawstring, alternate a size or reinforce elasticity. Details: Available in multiple colors and diameter sizes 5 yd. (4.5 m) length 3 mm cord is round, 5 mm cord is flat12 cord packs Spandex