Cinnamon sticks, often referred to as quills, are hollow rolled pieces of tree bark measuring 7 to 10 centimeters in length. The surface of the stick is red-brown and rough to the touch. Inside, Cinnamon sticks bear a darker, grey-brown hue with a smooth and powdery texture. The ends of the bark curl inward, resembling a thick scroll. The thickness of the rolled bark can vary from 5 to 10 millimeters, making the sticks hard to break and grind. Cinnamon sticks have a woodsy, earthy, and spicy aroma that can burn on the nose. Their flavor is mildly sweet and woodsy, with slightly bitter undertones and a warm spiciness.