US Art Supply Black Telescoping Drafting Tube - Outside Diameter: 3-1/4", Inside Diameter: 2-7/8" inch, Length: 25 to 42-1/2 inches US Art Supply Affordable, Black Plastic Telescoping Document Poster Tube with 3-1/8" diameter that expands from 25" up to 42-1/2" is ideal for artists, architects, and poster collectors Poster Tube is made of a very rigid plastic to protect contents from bending or creasing in transit. Tube is also water and light resistant, it protects materials against fading from exposure to sun light Now includes an Extra Long Shoulder Strap that is comfortable for use even when the tube is fully extended Storage tube has unlimited uses, such as storage for: posters, blue prints, maps, documents, large photo prints, drawings, artwork, arrows, fishing rods, drum sticks, or whatever else you can imagine