UNICEPT inner side of the casserole has a stainless steel body with insulation between the plastic and steel walls. Steel is non-toxic and easy to clean. The insulation ensures that the food remains piping hot for together. Stainless steel has no odor which helps the food to retain its original aroma and flavor. Since the material is corrosion and rust resistant, it is safe, durable and efficient at storing your foods for longer periods of time.This set of casseroles from UNICEPT comes with an elegantly designed exterior which features a dual-tone outer finish combined with attractive graphics. It makes an ideal gift for any occasion.