The body of the gong is made of bronze, shaped like a plate, the surface of the gong is flat without umbilical, the edge of the gong is slightly wider and the surface of the gong is vertical, and the appearance is solemn and solemn. Commonly, the diameter of the gong surface is 14 cm, the width of the gong edge is 2.5 cm, the wall thickness of the gong is 0.3 cm, and the gong edge has no holes and...