The 1948 Bowman set of 72 cards was the company's only basketball issue. Five cards were issued in each pack. It was also the only major basketball issue until 1957-58 when Topps released a set. Cards in the set measure 2 1/16" by 2 1/2". The set is in color and features both player cards and diagram cards. The player cards in the second series are sometimes found without the red or blue printing on the card front, leaving only a gray background. These gray versions are more difficult to find, as they are printing errors where the printer apparently ran out of red or blue ink that was supposed to print on the player's uniform. The key Rookie Card in this set is George Mikan. Other Rookie Cards include Carl Braun, Joe Fulks, William Red Holzman, Jim Pollard, and Max Zaslofsky.