Bronze is an alloy consisting primarily of copper, nearly 90 %, and the remaining comprising of aluminium, tin, zinc, and sometimes even non-metallic compounds such as arsenic, as may be required. These combinations produce a range of alloys to have properties such as stiffness, ductility, or machinability.

Bronze artefacts.
(Image source)

Bronze is a bearing class material. (Image source)

Bronze is a bearing class material.

Bronze is a bearing class material. (Image source)