The inner part of this 5 gallon water dispenser is made of food-grade steel, durable, anti-corrosion, high temperature resistant. Water Cooler Dispenser built-in ice maker makes 9 bullet ice cubes within 6-8 minutes ( depending on the ambient temperature ). It DOES NOT keep ice frozen.Electronic digital control,easy to operate ice cube maker through the control panel. Our water cooler built-in ice maker is bottleless and will reduce the cost of constant purchases of water. It is easy to clean with a removable Drip Tray.