The last large commercial sailing vessels, designed well after the Industrial Revolution, used engineered iron and steel in their construction. In general, the ships displaced between 2,000 and 5,000 tons and were cheaper than their wooden-hulled counterparts for three main reasons: (1) iron was stronger and enabled larger ship size, capable of delivering considerable economies of scale, (2) iron hulls took up less space, allowing more room for cargo in a given hull size, and (3) iron required less maintenance than a wooden hull.