Clear polycarbonate provides easy visibility, superior resistance to food acids and oils and withstands temperatures from -40 degrees to 212 degrees Fahrenheit. All sizes stack for easy, efficient storage. Fit standard carts and racks. Non-slip textured finish on corners, sides and bottom reduce scratches to keep boxes looking newer, longer. Smooth interior surface makes cleaning easy. NSF listed. Reinforced top and bottom corners on both box and lid, help prevent chipping and cracking. Polycarbonate. Clear.