These flat cup lids w/an opening for a straw fit the 20 ounce Fabrikal cups (also fit the Fabrikal 9 and 12 ounce squat cups). The lids 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. For use with cold beverages. Case of 1000 (10 packs of 100). Eco Categories: Biodegradable, agriculturally based, less toxic, animal friendly, reuseable.