World Centric compostable lids are made from NatureWorks Ingeo™, which is derived from plants grown in the USA. Even though they are as light and strong as plastic, they fully biodegrade when composted. Look and feel like plastic (clear or opaque), but made from Ingeo (TM) derived from corn Suitable for cold and warm foods up to 120 degrees Fahrenheit Non toxic in manufacturing and use. Use less energy in production compared with conventional paper and plastic. Generate significantly less greenhouse gases in production. Made from annually renewable resources. Conform to FDA guidelines for food use. Compost in 3-6 months in a commercial composting system