17.1 cm. 100% Compostable (Only compostable in industrial facilities) plates. Made from plant based material. Microwave safe. Why Choose Hefty EcoSave: These 100% compostable plates are made from plant based materials and deliver the heavy duty quality that you've come to expect of a Hefty plate. Microwave safe heavy duty. how2recycle.info. hefty.com. To contact us visit: Hefty.com, call 1-800-433-2244 or write: Hefty Brands, PO Box 85583, Richmond, VA 23285-5583. Product made of China. Why Choose Hefty EcoSave These 100% compstable plates are made from plant based materials and deliver the heavy duty quality that you've come to expect of a Hefty plate.