Our Storage containers are made with heavy-gauge COR-TEN (rust-resistant) steel construction. Weather and vandal proof, and are incorporated with the latest security features needed to protect you items. Reinforced and continuously welded steel frame that conforms to government and shipping standards. Fully vertically corrugated steel sides and end walls for strength. Die-stamped steel roof. 1 1/16" 18 ply marine grade hardwood flooring. Corrugated, hinged double doors with dual rubber gaskets. Forklift pockets are provided in accordance with ISO requirements for loading and handling