Chinese bronze casting and pottery advanced during the Shang dynasty, with bronze typically being used for ritually significant, rather than primarily utilitarian, items. As far back as c. 1500 BC, the early Shang dynasty engaged in large-scale production of bronze-ware vessels and weapons.  This production required a large labor force that could handle the mining, refining, and transportation of the necessary copper, tin, and lead ores. This in turn created a need for official managers that could oversee both hard-laborers and skilled artisans and craftsmen.  The Shang royal court and aristocrats required a vast number of different bronze vessels for various ceremonial purposes and events of religious divination.  Ceremonial rules even decreed how many bronze containers of each type a nobleman or noblewoman of a certain rank could own. With the increased amount of bronze available, the army could also better equip itself with an assortment of bronze weaponry. Bronze was also used for the fittings of spoke-wheeled chariots, which appeared in China around 1200 BC.