These tubes have a 3"" inside diameter and unique design that permits telescoping from fully closed 27"" length to fully extended 50"" length, Durable water-resistant plastic with a twist-off screw cap, Friction lock at any length by twisting tube, Tubes are designed for anything that can be rolled, Perfect for protecting charts drawings maps blueprints posters etc, against creases bends tears and folds, Adjustable length shoulder strap provides convenient portability, Strap and mounting can be removed for storage, Packaged 12/box, Black only, SKU: ALV5072