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: Taiwan 12 ounce, Clovernook 16 ounce and Ecotainer 10/12/16/20/24 ounce cups. Please note that these are early generation hot cup lids and the lids are a little brittle and a percentage of them (eg, 10-20%)crack a little. Please don't order if you can't tolerate the imperfection of these lids. Pack of 50. Eco Categories: Biodegradable, agriculturally based, less toxic, animal friendly.