These flat cup lids w/an opening for a straw fits the 10 ounce biodegradable clear cups (also fit the 8 ounce and 12 ounce tall 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 2500 (25 packs of 100). Eco Categories: Biodegradable, agriculturally based, less toxic, animal friendly, reuseable.