Double-walled insulation: This casserole consists a double insulation wall and a stainless steel inner surface that keeps the food hot and fresh for a long time. Made of Food Grade Material: This casserole is made from high-quality, 100% food-grade stainless steel material that is safe and hygienic to use. It resists staining, corrosion, and odors, making it an ideal choice for food storage and presentation.