Also available as a pack of 50, SKU - CP-CS-9-P. Pairs with lids- CPL-CS-9, CPL-CS-9F. World Centric compostable 9oz clear cold cups are made from PLA, (polymer made from plants). They are suitable for cold liquids, 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.