The bronze drum is a key symbol of Vietnamese identity and continuity.

Wikipedia, "A Đông Sơn drum is a type of ancient bronze drum created by the Đông Sơn culture that existed in the Red River Delta. The drums were produced from about 600 BCE or earlier until the third century CE; they are one of the culture's most astounding examples of ancient metalworking. The drums, cast in bronze using the lost-wax casting method are up to a meter in height and weigh up to 100 kilograms (220 lb). Đông Sơn drums were apparently both musical instruments and objects of worship."