These biodegradable hot cup lids are made from a variety of biodegradable materials, including polylactic acid (PLA), which is made from agricultural crops such as corn and potatoes. The lids are fully biodegradable and compostable. There are no animal or petrochemical ingredients in the lids. The lids fit the following cups: Ecotainer 10/12/16/20/24 ounce cups. Pack of 100. Eco Categories: Biodegradable, agriculturally based, less toxic, animal friendly.