12" x 3.5" ID Black Chartpak Expand-A-Tube Large Middle Section

CHARTPAK Expand-A-Tube Storage System Large Middle Section 12" 3.5 inside diameter. Used with the Expand-A-Tube Storage System Small Gray to increase the tube length 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.