Nozlen Drawing Tube Extra Large 4" Diameter - Expands 30" - 49". Light & Water Resistant. Perfect for Drawings, Blue Prints, Art Work, Posters, Maps, Other Documents. Model DT4001 Large, Heavy Duty Telescoping Black Drawing Tube with Multiple Locking Positions Adjustable Shoulder Strap and Adjustable Handle Can Hold Multiple Drawings, Artworks, Blueprints, Posters, Maps & Documents Perfect for Artists, Illustrators, Architects, or Hobbyists Light and Water Resistant Design