Dunnage Shelves are constructed of 1" square steel tubing with removable wire decking. Poly-Z-Brite features a true powder-epoxy over zinc-chromate electro-plating that ensures a strong durable finish that resembles the look of chrome, yet handles temperature and moisture extremes even better. Ideal for dry storage, coolers and freezers. Features NEX Guard , an anti microbial agent that protects the epoxy coating from bacteria, mold, and mildew that causes odors and product degradation. Limited Fifteen-Year Warranty against rust and corrosion.