These clear rectangular Ingeo™(derived from plants) deli containers are perfect for fruits and salads. They are heat resistant up to 110 degrees Fahrenheit. World Centric® compostable food containers are made from NatureWorks Ingeo™, which is derived from plants grown in the USA. Our biodegradable containers meet the most stringent scientific requirements for biodegradability and compostability, and are ASTM D6400-99 certified for "compostable plastics". Even though they are as light and strong as plastic, they fully biodegrade when composted.