The inside of the casseroles is Polyurethane thermal insulated which keeps the food warm for a longer time & retains the flavor and temperature of stored food. Different sizes of casseroles make them usable for serving multi cuisine in varying portions. Made from premium quality material, the functional lid of the casseroles makes opening and closing very easy. Stylishly designed, this set of three casseroles will enhance your dining table and make mealtimes fun and exciting & is also a good option for gifting purposes PU insulated bowl is always a healthy choice Each bowl maintains food temperature warm for up to 4 hrs, and cold for up to 6 hrs. It’s hassle-free and healthy - avoid reheating - you don’t need to microwave and it will preserve the food’s essential nutrients, vitamins, and taste. Serve in style and enhance your table décor with our great quality modern multi-functional insulated casseroles that ‘redefine freshness and fashion This set works well as a gifting option too. These casseroles have an elegant and refined design. They have a stylish knob that is very distinctive.