These MetroMax i 24" x 48" shelves are rust and corrosion resistant. They feature an innovative polymer design that provides the performance of stainless steel at a fraction of the cost Antimicrobial properties are built in to inhibit the growth of bacteria that may affect this product. The antimicrobial properties do not protect users or others against bacteria, viruses, germs, or other disease organisms. Always clean and wash this product thoroughly before and after each use.