Stainless steel material: The interior of the lunch box is made of high-quality 304 stainless steel, non-toxic and tasteless; the shell and lid are made of food-grade safe PP plastic, BPA free, use with confidence. Portable design: The transparent lid of the lunch box has a sealing silicone ring, which cooperates with a U-shaped latch to seal efficiently and prevent food from overflowing. Free choice of capacity: 2-layer stackable stainless steel lunch box, the metal inner tank can be removed, the use capacity can be increased, the food quantity can be flexibly controlled. Heat preservation: Lunch boxes can usually keep food temperature for about 3-4 hours. Lunch box lids and stainless steel inner pots cannot be placed in a microwave oven. Croud and occasion: The lunchbox has simple and stylish colors and classic design, feels good in hand, suitable for kids and adults using at school and work.