World Centric® compostable 7x5x2" black sushi boxes with PLA clear lids are made from NatureWorks Ingeo™, which is derived from plants grown in the USA. Even though these takout boxes are as light and strong as plastic, they fully break down when composted. These containers are eco-friendly, compostable, freezer safe, and suitable for food up to 120°F. Composts in 2 to 4 months in a commercial composting facility. Not microwavable.