Cinnamon is a spice obtained from the inner bark of several tree species from the genus Cinnamomum. Cinnamon is used mainly as an aromatic condiment and flavoring additive in a wide variety of cuisines. Types of Cinnamon Quills Alba best quality Cinnamon. Diameter between 6mm to 7mmin. C5 Special Second best quality Cinnamon. Diameter between 8mm and 9mm. C5 Third best quality and most commonly used Ceylon/Sri Lankan cinnamon. 10mm to 12mm in diameter. C4 Diameter between 13mm and 14mm. M5 Thin Sticks and rough on the surface. Diameter between 15mm and 17mm. M4 Diameter of quills between 18mm and 20mm. H1 General quality cinnamon. Diameter of quills between 21mm and 22mm. H2 Sorted part of rough Cinnamon thicker than H1 diameter between 23mm and 25mm.