MATERIAL: The extendable cord is made of elastic which makes it stretchable, durable and sturdy enough for long run. The thread has strong elasticity and will not easy to broken. Good for adding an adjustable waistband for your child Perfect for quick fixes on any waistband Elastic is used in the textile industry for tightening, gripping, and holding things with ease Widely used for making DIY projects, art and crafts, fashion accessories, sewing, knitting, headbands, waistbands etc.Can be used for various arts and crafts projects such as making dolls and clothingFlat elastic cord; Abrasion and mildew resistant; Great elasticity.