Chinese gongs are made of high-tin bronze, hammered into a sifter shape. Its central resonating area can be either flat or convex. At least its long history can be traced back to the early Western Han period (206BC-AD 24) according to an archaeological find from a tomb of that period in Guangxi. In the Tang text (618-907) it is called Shaluo (sand gong), the earlier evidence in classical literature. Modern varieties are great in number with varying tone qualities. The name is usually preceded by a prefix to specify each different kind. The largest type (over 120cm in diameter) called Dachaoluo, with the name from its deep and grave tone, is used in weddings, funerals and temple ceremonies. The smallest goujiao luo (dog-call gong), only 8cm in diameter, can often be seen in theatre instrumental ensembles in southern Fujian province. Both the larger and the smaller include a series of types under different names and in varying tone qualities. Much more are the derivative types in ethnic minorities with individual acoustic features, functions and performing styles.