Incense spirals or incense coils are one type of incense. An incense coil is made entirely of incense. They are called incense spirals because they are shaped into a spiral instead of a straight stick shape and can burn for many hours. There are many forms of Chinese incense and its use and formulation theory is strongly tied to Traditional Chinese medicine and are still referred today as "fragrant medicines". Use of incense has long been as much for healthy well-being as religious ceremonies.