Material: The lunch box is primarily made of stainless steel, known for its durability, resistance to corrosion, and easy cleaning. The lid is made of polypropylene (PP), a durable and food-safe plastic material. Design: The lunch box typically has a rectangular or square shape, with a hinged lid that seals tightly to prevent leaks and spills. The stainless steel body gives it a sleek and modern appearance. Insulation: Some steel lunch boxes may feature double-wall insulation to help keep food hot or cold for an extended period Lid: The lid is made of polypropylene, a commonly used food-safe plastic known for its durability and resistance to heat. It typically has airtight or leak-proof properties, ensuring that your food remains fresh and secure during transit. Easy to Clean: Stainless steel is easy to clean and maintain, and the PP lid can be cleaned with mild soap and water. 15.7 x 7.1 cm (L x W)