The drum frame is made of walnut or sycamore wood slats. It is flat and round. The two ends are covered with untreated raw cowhide with hair. The edges of the skin are fixed with two rows of bamboo nails, and the bamboo nails are exposed by 1.5 cm from the drum frame. The size of the drum varies. The larger drum has a diameter of 40 cm to 45 cm and a drum height of 20 cm. For the smaller d...