The bows used during Koryo Dynasty included Donggung, Jangomgung, Segung, Kakgung and so on. Sejon, Ryuyopjon, Taewujon, Pyonjon, Jukjon, Choljon were arrows in this period.
Kakgung was made of mulberry tree, cow’s horn and tendon. Ryuyopjon was consisted of the arrow shaft made of willow branch and lanceolate arrowhead. When shooting Ryuyopjon with Kakgung, it flew away up to 120 steps and its rate of hits was very high.
Later, the arrows of Koryo got bigger and more powerful. As powder horns were installed in the arrows at the beginning of the 12th century, they developed into more powerful arrows with fire wicks.