The 2019 Leaf Ultimate Sports The Core Four Yankees trading card set features baseball collectibles from the iconic team. With only 25 cards in existence, this limited edition set captures the essence of the team's history and significance. As a high-quality sports trading card set, Leaf offers collectors a chance to own a piece of baseball legacy with each card in this exclusive collection.This is the Ultimate Core 4. Card is numbered to 4 which is a thing with Collectors.