Description: Durable food containers are made from heavy duty polycoated paperboard to help seal in warmth and freshness. Containers work to keep food at its' optimal temperature, so that it tastes the way it should. They tolerate a wide range of temperatures, holding strong from freezing, all the way up to 190 degrees Fahrenheit. Accompanying vented lids seal tightly to prevent messy spills. Non-microwavable.