This lunch box is different from the usual plastic inner container lunch boxes. Our material is high-grade plastic PP material plus stainless steel inner container, which is a 100% non-toxic and environmentally friendly product.The inner layer of the lunch box is made of EPS foam, and the inner pot is made of brand new stainless steel material. It has the function of insulation, which can maintain the temperature for 3-5 hours.The lunchbox has excellent quality, with a long-lasting insulating effect. The design of the lunchbox focuses more on fashion and convenience, making it very beautiful and cute. It is a great helper for carrying meals in our daily life.