The C5 Cinnamon Special grade is one of the best cinnamon grades. This real cinnamon grade is second to the Alba Cinnamon in thickness (diameter) and price. Diameter 10 - 12 mm The best true cinnamon sticks are harvested from natural farms on the south coast of Sri Lanka. C5 cinnamon features a stronger cinnamon flavor. C5 Ceylon cinnamon is mild and subtle. It's perfect for cooking, baking, and beverages.