The Compostable Burger Box is constructed out of bamboo and unbleached plant fiber. The small clamshell container is both microwave and freezer safe making it a great choice for both hot and cold food items. Soak proof and has no plastic or wax lining and safe for hot foods up to 220F. Will compost in a commercial composting facility. - Natural; Plant Fiber/NIA-P - Length/Width 6 in - Height 3 in - Sold per case; 500 per case