Fiber Lids for Fiber Containers, 7.8 x 10.1 x 0.5, Natural, Paper, 400/Carton Made from bamboo and unbleached plant fiber, an annually renewable resource. 100% compostable in two to four months in a commercial composting facility. They are soak proof and have no wax or plastic lining. Great for hot or cold items. Durable and freezer-safe.