Topps Series One 2015 Baseball Cards: Pack of 12 Cards 12 Cards per pack! Exclusive Topps Trading cards for 2015 Baseball Year 2015 Topps Baseball Series 1 will feature new inserts, autographs, and relics celebrating some of the greatest moments in Baseball history, as well as the biggest stars of today And the 2015 Topps online program is sure to keep collectors coming back throughout the year and beyond!