 The reverse can feature statistics, biographical information, or as many early cards did, advertising.There is no fixed size or shape of hockey cards, running the gamut from rectangular to circular, however modern North American cards have typically standardized on a 2.5 by 3.5 inch (6.35 cm by 8.89 cm) rectangular format.The first hockey cards were included in cigarette packages from 1910 to 1913, manufactured by Imperial Tobacco Canada for the inaugural NHL season.