Screen printed tape measures (28" on Small Wrap; 36" on Medium and Large Wraps; 48" on Extra Large Wrap) which limits the need for an extra tape measure and makes mark-up much easier. They also include a circumference & quartering scale which limits the need for calculations because the exact circumference, ¼, ½ and ¾ of the circumference, plus the actual diameter of pipes 2" through 30" is printed on the outside of the wraps.