On the other hand, gekkin for Xing-era music has an oval (almost perfect circle) sound chamber and two courses of paired silk strings (today, nylon string is also used) and, usually, a metal echo wire is equipped in the sound chamber (Every time, the musical instrument is played, the hibikisen in the sound chamber jingles because of vibration).
これに対して、清楽の月琴は、胴体は真円に近い楕円形で、絹弦(現在ではナイロンも使う)の複弦を2コース張り、胴内に金属製の「響き線」が入っているのが普通である(楽器を弾くたびに、振動で胴内の響き線がチャラチャラと鳴る)。