The 1991 Upper Deck Baseball Cards Collectors Choice is a vintage sealed box containing 100 standard-sized trading cards from the Major League Baseball (MLB) season. This collectors edition set features various players and athletes from that era, with the cards being manufactured by Upper Deck in the United States. The set includes cards from the 1991-92 season and is a valuable collectible for fans and enthusiasts looking to add a piece of baseball history to their collection.