C4-:This grade is yellow or light brown in appearance. This grade also falls under the Continental Cinnamon grade. This Continental cinnamon grade-C4 size is 13–14 mm in diameter.
C5-: C5 comes as the third highest quality cinnamon type which is available in Sri Lanka. Being smooth and slender in appearance, C5 grade of cinnamon is sweet in taste and deep yellow in color. As far as the size of the diameter is concerned, it varies between 10 mm to 12 mm.
You can buy cinnamon C4 grade in a variety of cut sizes. For example, 5 inches, 10 inches, or 21-inch cinnamon cuts.