The cards in this 28-card set measure 2 1/2" by 3 1/2". The 1955 Robert F. Gould set of black and white on green cards were toy store cardboard holders for small plastic statues. The statues were attached to the card by a rubber band through two holes on the side of the card. The catalog designation is W605. The cards are numbered in the bottom right corner of the obverse and are blank-backed.