These Dunnage Racks are made with highly durable material and will not rust, crack, chip or corrode. This product is color coded and is ideally used for product coding and complementing merchandising. These Dunnage Racks are freezer and refrigerator safe and can be in extremely low, and high temperatures. This product comes with a twenty five year guarantee and is promised not to harbor any bacteria. These Dunnage Racks have both a slotted front and back to maximize air circulation as well as simplify loading or unloading.