The Blue Heavy 15 Loop is a high quality latex band that is pre-formed into a loop. You do not have to cut and tie it. Use the pre-made exercise loop to perform almost any upper or lower body exercise. The highly portable band can be taken anywhere. There are 7 progressive levels of resistance to accommodate the lightest to the strongest needs. The Full Body Set consists of 10, 15 and 30 loops of specified color. They can be used for a total body workout. The lengths represent the loop when it is flat. A 10 loop is equivalent to 20 of flat band cut and tied in a knot. The loops are 3 inches wide.