Master knife, also known as bell knife, ring knife. It is the Manchu, Zhuang, Miao, Yao, Dong, Tujia, Han and other nationalities who shake the body and sound musical instruments. It is called Hama knife in Manchu, and Shaman knife in Northeast. When playing, the player can hold a knife or two knives, and shake the handle of the knife up and down, left and right, so that the small iron ring hits the back of the knife, the large iron ring, the decorative piece or collides with each other and makes a loud sound. In the old days, it was used in activities such as shamans and masters, and it was an instrument of practice and exorcism. It was played, sung and danced at the same time. Today, it is used to accompany folk songs and dances, and it is a very distinctive rhythm instrument.