This Duralex French-made, glass, square container with a frosted plastic tight-fitting lid is perfect for storing food, reheating leftovers and more. Without the covers they are even chic enough to use as serving pieces. Each container is thermally resistant for refrigerator-to-microwave convenience. Durable tempered glass resists chipping, and the BPA-free plastic lids can sustain temperatures up to 158℉