3 neat steps with easy find lids. BPA free. Leak-proof lid seal. The only glass food storage with easy find lids. Lids and bases neatly nest for compact storage! Oven safe (oven safe up to 425 degrees F [218 degrees C]. Lid is not oven safe). Microwave safe. Dishwasher safe. Freezer safe. Bases made in USA. Lids made in China.