FOOD GRADE PP PLASTIC & STAINLESS STEEL MATERIAL: Made from the best durable and environmentally friendly materials. The inner food tray is made of food grade stainless steel, the shell of this lunch box is made of food grade PP plastic, non-toxic and healthy, 100% safe for humans. PORTABILITY: You can use it everyday to carry and conveniently heat meals in your office and you can also use it to whenever you travel. Sealed outer container to retain heat and keep foods fresh, built-in utensils tray, and two handles to make it easy to carry the box. EASY TO USE: Prepare your own favorite healthy meals at home and then conveniently plug in the lunchbox at work to enjoy your great cooking. It will slowly and evenly heats your meal to preserve moisture and enhance flavor. SEPARATE DESIGN: With 3-layer separate design, it is easy to separate and clean. The inner food tray has 3 parts, separating the rice and vegetables, won't odor.