Yahweh will give more valuable building materials to them now. Alternate translation: "instead of wood, I will bring bronze, and instead of stones, I will bring iron" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
Yahweh describes "peace" and "justice" as human rulers. This means there will be complete peace and justice in the land of Israel. (See: [[rc://en/ta/man/translate/figs-personification]])