Moxibustion is the practice of burning a herb on or close to the body in order to generate specific therapeutic effects. The herb that is used is Artemesia Vulgaris, commonly known as Mugwort. The leaves of the mugwort plant are dried and refined to remove the rough stems and the resulting compound, which is known as moxa or moxa punk, has a soft and fluffy consistency which is readily moulded and burns smoothly.

The degree of refinement of the moxa punk determines a range of qualities: the most refined moxa punk is a pale golden yellow, it is very dry and fluffy, has few impurities and it ignites readily and burns evenly with very little smoke and a pleasant smell; the less refined moxa is darker and greener, it has thicker fibres and a coarser consistency and generates a harsher smoke.