Talk:Tin Pickaxe/@comment-26572682-20150918215601/@comment-3157150-20150919115151

Consider also that the tin pickaxe does not suffer the -1 range penalty as the Copper Pickaxe, has higher damage and belongs to a metal tier that's armor set is a higher tier than Copper's. (Copper Armor gives 8 defense total, Tin gives 9.)

The metal tier is mostly what that statement refers to.