All plastic construction won't rust, dent, chip or peel. Rounded corners and smooth surfaces are easy to clean. Slip resistant and extended bottom. Materials are FDS compliant for food contact. All certified to NSF Std. #2. Fits 40" and 48" pallets with no overhang. Nestable for efficient storage and transport. Stackable with and without lids. USDA 3A (Dairy) Sanitary standards and Meat & Poultry Equipment Group Listed. Gray.