Each Casserole in this set is designed to keep your food hot for long durations. the stainless steel inner surface of the casserole helps to keep your food fresh and healthy. A Thick Polypropylene Insulation to ensure Food remains Warm or Cold upto 6 hours.No need to Heat Food again in Stove or Microwave. Reheating robs food of Essential Nutrition,Taste & Aroma. It also saves Precious Time & Energy. The perfect serving Casserole that comes in set to serve at any special occasions like parties or for daily use to keep your Roti/ chappati,rice or vegetables hot and fresh Twist Lock with food safe quality that keeps food fresh and hot for a longer period of time CARE AND CLEANING :Easy to clean and easy to use, dishwasher safe