This adjective describes objects made of bronze or copper, metals widely used in the ancient world for tools, weapons, vessels, and idols. John uses it in Revelation when describing idols that people refused to stop worshiping even after the plagues: 'they did not repent... of their murders or their sorceries or their immorality or their thefts, nor did they cease worshiping demons and idols of gold and silver and bronze.' The inclusion of bronze idols alongside gold and silver reflects the full range of material idolatry, from expensive to common, all equally incapable of seeing, hearing, or walking.