Heavy stretch knit elastic is designed to be a bit stiffer and offer more "kick" to its stretch than other elastics. it offers a stiff, strong stretch and can be used on heavier fabrics. * The elastic will not narrow when stretched making it perfect for exposed waistbands to top off a gathered skirk or pants. heavy stretch knit elastic is also great for cuff bands and jacket waistbands. * Each spool contains 10 yards of elastic that is black in color and is 1 1/2 inch wide * 70 percent polyester, 30 percent rubber