The 1948 Bowman set is considered the first football set of the modern era. The set consists of 108 cards measuring 2 1/16" by 2 1/2". Cards were issued in one-card penny packs. The entire front is comprised of a black and white photo. The backs contain a write-up and an offer for a football. The cards were printed in three sheets; the third sheet (containing all the card numbers divisible by three, i.e., 3, 6, 9, 12, 15, etc.) being printed in much lesser quantities. Hence, cards with numbers divisible by three are substantially more valuable than the other cards in the set. The second sheet (numbers 2, 5, 8, 11, 14, etc.) is also regarded as slightly tougher to obtain than the first sheet (numbers 1, 4, 7, 10, 13, etc.) which contains the most plentiful cards. An album with which to house the set was produced. Key Rookie Cards in this set are Sammy Baugh, Charley Conerly, Sid Luckman, Johnny Lujack, Pete Pihos, Bulldog Turner, Steve Van Buren, and Bob Waterfield.