bhagyalaxmi serving pot is made of stainless steel material which is rust roof material specially designed double walled casserole 10-15mm thickly insulated with polyurethane which keep the food hot many hours. the inside bowl&plate is fabricated out of non-magnetic stainless sheet&polished to mirror finish standards.always fill the casserole hot infull extentto censures maximum heat retention always close the insulated casserole with the lid cover.food items like hot tortillas, breakfast muffing&chapattis should be wrapped with clear cloth before placing inside .do not keep the insulated casserole over burning stove nor expose it to flames. to keep food hot please wash the inner stainless steel container with hot water.similarly to keep food cold please wash the inner stainless steel with cold water