Also available as a pack of 75, SKU - TRL-CS-BB-P. World Centric compostable clear lids for 5-compartment bento boxes are made from (polymer made from plants). Great for warm or cold food, these lids are heat resistant up to 110 deg F. Not microwavable. PLA products should be stored in a cool place below 110 deg F and out of direct sunlight. These are certified compostable in a commercial facility, which may not exist in your area.