World Centric 10 x 7.5" clear lids for fiber containers are made from PLA, (polymer made from plants). Great for warm or cold food, these lids are heat resistant up to 110°F. Not microwavable. PLA products should be stored in a cool place below 110° F and out of direct sunlight. These are certified compostable in a commercial facility, which may not exist in your area. Pairs with containers: TR-SC-U10, TR-SC-U10L, TR-SC-U10T-LFS, and TR-SC-60.