Whole cassia bark is made from dried cinnamon bark, rolled like a plow. Cinnamon tubes have different thicknesses and are classified into three main types:

Type A: thickness> 4mm, usually used to produce cinnamon powder, …

Type B: 2.5-4mm thickness, commonly used to produce square cut cassia, round cut cassia, ..

Type C: thickness <2.5mm, usually used to produce pressed cinnamon, split cinnamon, ..