These 16/18 ounce plastic cups are clear and are made from polylactic acid (PLA), which is made from agricultural crops such as corn and potatoes. They are fully biodegradable and compostable. There are no animal or petrochemical ingredients in the cups. Reuseable. For use with cold beverages. Pack of 50. Eco Categories: Biodegradable, agriculturally based, less toxic, animal friendly, reuseable.