2012 Diamondbacks Topps is a baseball card team set that manufactured and distributed by Topps. As part of the exclusive agreement with the MLB that ran from 2010-2015 only Topps could make any MLB licensed baseball cards and thus all team sets were made by Topps. The card fronts are nearly identical to the standard base 2012 Topps set. But the cards are numbered with an ARZ prefix to differentiate them from the normal Topps release.