|Drawing of a Fei Huo Xiang Mo Chui, from 'Wu Bei Zhi (《武備志》)'.|
Fei Huo Xiang Mo Chui is made of white poplar wood of about eight cun long and three cun circumference (not counting its narrower handle). The top part of the wood is hollowed and filled with incendiary gunpowder. Several holes are drilled into the side of the wood to serve as muzzles (the bomb does not explode literally, but projects flames through these muzzles), and up to twenty barbed spikes are nailed into the wood. The bomb is usually waterproofed with oil paper.
When thrown, the bomb catches easily onto enemy rigging, deck, or even human body. Its barbed spikes prevent the enemy from remove the bomb easily. While usually employed as naval weapon, it is just as viable to be used in ground warfare.