10 oz. Paper Cups, 50 cups per pack. Instead of using a petroleum-based lining to make them waterproof, these eco-friendly paper cups use a plant-based resin that is sturdy enough to withstand hot beverages. The 100 percent natural resin is also an annually renewable resource. The hot beverage cups offer a rolled rim at the top for durability and comfort. Rim is designed to accept both flat and domed lids. Lids are not included.