Also available as a pack of 50, SKU - CUL-CS-12F-P. World Centric compostable clear cold cup lids fit 12 to 22 ounce paper cold cups. These lids are made from PLA, (polymer made from plants). They are suitable for cold liquids, and freezer safe. 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.