Product details Mainstays glass food storage container can keep food fresh and healty with airtight seal. It is made of borosilicate glass so that it is much stronger and can hold up to temperature changes much better than cheaper one. BPA FREE AND FDA APPROVED so it will not affect the food inside the food container. OVEN, MICROWAVE OVEN, FREEZER & DISHWASHER SAFE - easy to be heated, storage, and cleaned, including oven up to 752°F. DO NOT use lids in the oven or microwave oven.