World Centric compostable clear lids for 20-48 oz fiber boxes are made from NatureWorks Ingeo, which is derived from plants grown in the USA. They are suitable for liquids up to 120F, freezer safe and compost in 2 to 4 months in a commercial composting facility. Even though they are as light and strong as plastic, these disposable lids fully break down when commercially composted. Not microwavable.
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