Alongside those works, Serra designed a series of forged pieces including "Two Forged Rounds for Buster Keaton" (1991); "Snake Eyes and Boxcars" (1990-1993), six pairs of forged hyper-dense Cor-Ten steel blocks;, "Ali-Frazier" (2001), two forged blocks of weatherproof steel; and "Santa Fe Depot" (2006).