sound box
It is trapezoidal, oval or triangular, the front is covered with a pine or fir panel, and there are several small circular sound holes in the middle of the panel.
headstock
The flat top is unadorned, and there are four wooden pegs on both sides (two on each side).
piano bar
Short and wide, the surface is a fretboard, and there is no fret.
bridge
A wooden bridge is placed under the panel.
strings
Zhang has four strings. In the past, gut strings were used, but now they are mostly steel strings.