Bronze
Source: Pathfinder Roleplaying Game Ultimate Combat
Before the advent of iron and steel, bronze ruled the world. This easily worked metal can be used in place of steel for both weapons and armor.
For simplicity’s sake, similar or component metals such as brass, copper, or even tin can use the following rules, even though in reality bronze is both harder and more reliable than those metals.
Weapons
Light and one-handed weapons can be crafted from bronze. Likewise, spear points, arrowheads, and axe heads can be crafted from bronze, even those that are parts of two-handed weapons. Bronze is too weak to be used for two-handed weapons made entirely out of metal, and cannot typically be used to craft polearms, with the exception of the rhomphaia, which is provided in the section on Bronze Age equipment. Bronze weapons have the hardness of their base weapons but also have the fragile quality. Bronze weapons do the same damage as steel weapons of the same type, and have the same cost and weight.
Armor
Bronze can be used to create any medium or light armor made entirely of metal or that has metal components. It protects a creature as well as steel armor does, but it has the fragile quality. Bronze armor has the same cost and weight as normal steel armor of its type. Bronze armor has a hardness of 9.