The rack is made from highly durable polypropylene which makes it highly resistant to high temperatures up to 93 degrees Celsius and cleaning chemicals. These racks are also available in 9 other colours which means they are ideal for setting up a colour-coded cleaning system, helping you to quickly identify glassware types whilst in storage. With closed sides, the racks also keep your pots, pans and bowls sanitary once cleaned, so they will remain fresh until next use to save extra time and effort on cleaning.