Johnson Level makes this 25-foot grading rod out of fiberglass. This material provides both a waterproof and corrosion-resistant construction. They form the fiberglass into a rectangular shape round the back of the rod.Johnson forms this 25-foot telescoping grade rod out of 6 sections. These sections retract for easy storage.The graduations printed on the front are in inches / eighths. A scale on the back allows for overall height readings in feet and inches.Includes a carrying bag.