Generally, it is made of red sandalwood and mahogany, and in some places, it is made of jujube heart. The material must be firm and dry, and there should be no scars or splits. The appearance is smooth, with moderate arcs and corners. Applied to opera music, rap music and folk instrumental ensemble. Li Diaoyuan's "Drama" in the Qing Dynasty: "With the bang as the board, the Yueqin responds...