A Bronze Age period follows, from around 600 BCE to 800 CE. Between the 8th and 3rd century BCE, the island of Bali acquired the "Dong Son" metallurgical techniques spreading from Northern Vietnam. These techniques involved sophisticated casting from moulds, with spiral and anthropomorphic motifs. As mould fragments have been found in the area of Manuaba in Bali, it is thought that such implements were manufactured locally rather than imported. The raw material to make bronze (copper and tin) had to be imported however, as it is not available on Bali.
