These Microwave Safe Stainless Steel Containers shall help you in keeping your food hot and safe. Airtight Spill proof Lids . The Containers have a Steel Interior and Plastic Coated Exterior and can be used easily for easily re-heating food at Office / Home in the Microwave WITHOUT lid. The Exterior gets heated up first and then heats up the Stainless Steel in which your food is absolutely safe. Hence it might take some time more than regular to heat up your food. So Go Ahead and Buy Yourself a Set!!