These trays are made from Sugar Cane Fiber “Bagasse”, the fibrous waste left over after the extraction of the sugar from the cane. Tolerate both high (212 F.) and low heat applications holding either wet or dry food. These products are sturdy, grease and cut resistant, and microwave/freezer safe and is the most cost effective replacement for Styrofoam. Our cups comply with ASTM6868 standards for compostability