... for 4~6 hours Bento Lunch Box,Thermal Container,Food Material:Food Grade PP, Stainless Steel, Stainless IronMaterial free:Phthalate, melamine, BPA ... :Cadmium, Lead safetyCare instructions:Top rack dishwasher safe, hand-washing suggestedDishwasher safe:NoMicrowave Oven Safe:No for stainless inner tank and Glass tankYes ...