World Centric compostable 6x6x3" clear hinged clamshell containers are made from PLA, which is derived from plants. These takeout containers are the eco-friendly choice for delis, concession stands, food trucks, takeout restaurants, and cafes. Appropriate for cold foods only. Not microwavable. PLA products should be stored in a cool place below 110 F and out of direct sunlight. They are certified compostable in a commercial facility, which may not exist in your area.