Innovative and ideal for a multitude of uses, including storing, mailing or transporting drawings, charts, blueprints, maps and posters. Made of virgin high density polyethylene, the lightweight durable tubes are water resistant and ultraviolet light proof. Plus, the unique interlocking design lets you add optional middle sections by simply screwing them into place, adding a full 12" in length per section! A tube of any length can be created by adding additional middle sections. Use to store items like school banners or flagpoles. Tubes are 26 5/8" long and are available in two color-coded diameters: 2½" (grey) or 3½" (black).