All polymer corrosion proof shelving constructed of advanced polymers and Type 304 stainless corners. Shelves adjust in 1" increments. One-piece solid mats offer maximum spill retention and are ideal to protect items on the bottom shelf from dirt or backsplashes from cleaning floors. Lifetime warranty against rust and corrosion. Built-in Microban antimicrobial product protection to keep the product "cleaner between cleanings".