Various images of Material of bows & arrows
  
      199. Material for Gakgung(Horn bow)

Courtesy: Yeonse University Museum
From the left Air bladder of a sciaenoid fish: Boiled and made into glue.
Ox tendon: Hard tendon is pounded into a thin thread and glued to the backside of the bow.
Water buffalo horn: Imported from China or Southeast Asia.