Copper Bars are the refined form of Copper Ore, requiring 3 ores for each bar. Copper is the weakest of metals available. Because of this, it is not usually used once the player reaches the Iron Armor tier, from then on, everything used is Iron, Silver or a higher quality material.
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It is better to sell Copper Ore, rather than Copper Bars, since Copper Ore will fetch the same price, but without having to take time to refine it into bars.