What is The Bo (钹) copper plates

Bo, also known as "Tongpan" (copper plate), is generally made of copper. It is in the shape of a circular plate with a raised center, and a red cloth strip is tied to the raised part. There are differences in size: the larger ones are called "Raobo", "Naobo" or "Dabo" (large cymbals); the smaller ones are called "Cha" or "Chaizi" (small cymbals). When playing, one holds the cloth strip of each plate in both hands and strikes them together to make a sound.

 Sometimes, one plate is placed on a circular concave cloth pad, and the other is used to strike it. On the Taoist altar, it is usually used in conjunction with the dang (a small gong with a long handle).