Bronze is an alloy of copper, tin and a small amount of lead. Its appearance marked the advancement of human culture from the Stone Age to the Bronze Age. From the 17th century BC to the Han Dynasty (206BC-AD200), Chinese people used rare and precious bronze to cast large quantities of ritual vessels, musical instruments and weapons that were elegant in form, finely decorated and clearly inscribed with Chinese characters. They affirm the artistic achievements of ancient China, and demonstrate how early Chinese used their ingenuity to create works that incorporated both science and art from natural resources.