Hello,


The era of the Shang and the Zhou dynasties is known as the Bronze Age of China, because bronze, an alloy of copper and tin, used to fashion weapons, parts of chariots, and ritual vessels, played an important role in the material culture at that period of time. The Bronze Age started around 1700 BCE in ancient China. Around this time, men learned how to mine copper and tin to make bronze weapons. Bronze is a combination of 10% tin and 90% copper.

I hope this helps.