These are the old lids for the D700, P600 and P700 deli bowls, which fit a little looser. They are made from polylactic acid (PLA), which is made from agricultural crops such as corn and potatoes and are fully biodegradable and compostable. There are no animal or petrochemical ingredients in the lids. Reuseable. For use with warm/cold foods (ie, up to about 110 degrees). 50/pack. Eco Categories: Biodegradable, agriculturally based, less toxic, animal friendly, reuseable. Note: discontinued, limited stock available.