Bronze

Bronze allowed for high improvement for siege weaponry everywhere, especially in China. China designed multiple great weapons with bronze components, an example to the left,the Trebuchet. a marvel of  siege weapons. This was one of the best and still is (of the medieval variety) the best siege weapons,made for battering walls and breaking them. sometimes the soldiers lit the boulder on fire for more damage. 

The also made crossbows' triggers out of bronze,allowing each one to have a constant holding strength and firing distance. The bottom piece sticking out is the trigger part that you pull to release the arrow, said arrow being held by the top fin looking piece.

These large or medium sized vessels were made to house wine, commonly drunk in the Shang dynasty. They usually made these widespread and pure with bronze, as a show of wealth. as said before mainly the extremely wealthy had decorative vessels, to the left is a basic made vessel for the commoners. Certain vessels were made for rituals as well,known as Guang. Other vessels were called Jue, used as other ritual dealing things for drinking instead of pouring.

This is made with gold and copper, as stated below, the copper from China mines, the gold most likely traded from Africa. This one has a dragon-like design on the vessel and golden animals outside with a bird headed spout.