KEEP FOOD WARM:The stainless steel bottom of the inner layer of the thermal lunch box is designed with PU foam filling, which keeps the heat preservation longer and can provide 3-4 hours of heat preservation effect. Before use, it is recommended to wet the inside and outside of the bento box with hot water to preheat. After the food is cooked, it is recommended to put it into the bento lunch box immediately, and then put it into the insulated bag (don't wait for all the bento box to be packed)
Food Grade Material:Vrupan lunch box set is made of high quality food-grade safe PP plastic (external) and durable 304 stainless steel (internal), BPA free, No rust, no odor retention, so you can use it without any worries. HEALTH AND SAFETY, Unique design, fresh and elegant style, perfect for women and men.