Lids and cups are made from annually-renewable plants, not petroleum. Made from PLA, a resin derived entirely from plants, the Greenware difference resonates with consumers. BPI® certified to be 100% compostable in industrial facilities, which may not be available in your areas. Not suitable for home composting. Five of the most popular size Greenware drink cups fit one lid series for optimized inventory. Crystal-clear cups provide premium product clarity and presentation. Crystal clarity, premium quality and durability.