... stainless steel bento lunch box keep Warm&Cold for 4~6 hours Bento Lunch Box,Thermal Container,Food Material:Food Grade PP, Stainless Steel, Stainless ... safe:NoMicrowave Oven Safe:No for stainless inner tank and Glass tankYes for PP ... fresh as possible.Hot or cold Unbreakable stainless steel interior and Food-Grade PP exterior, ... produce as customers' request Stainless Steel Bento Lunch Box