Hardware: five metals. In ancient times, it refers to five metals such as gold, silver, copper, iron and tin, which were artificially processed into metal objects such as knives, swords and works of art. "Wu Yue spr···

Hardware: five metals. In ancient times, it refers to five metals such as gold, silver, copper, iron and tin, which were artificially processed into metal objects such as knives, swords and works of art. "Wu Yue spr···