The 2026 Topps Series 1 Featuring Team Sets, Future Star, League Leaders, Veterans cards, Cup Cards and Team Checklists. This baseball trading card set includes top players such as Bryce Harper, Mookie Betts, and Ronald Acuña Jr., along with promising rookies like Jackson Holliday and Adley Rutschman. The cards are standard size and made of card stock, representing teams like the Boston Red Sox, New York Yankees, and Los Angeles Dodgers. This set is a must-have for any baseball card collector looking to add some of the best players from the 2026 season to their collection.