Made from plant based PLA (polylactic) compostable plastic. Specially designed to pair with rectangular deli containers. Freezer safe. 100% compostable in two to four months in a commercial composting facility. Not microwavable. PLA products should be stored in a cool place below 110°F and out of direct sunlight. Food Container Type: Lid; Material(s): PLA; Material Type: Plastic; Color(s): Clear.