This 28-card set was produced by Marathon Oil, and its company logo appears at the bottom of card back. The cards were given away at the Cubs' home game against Montreal Expos on August 14, 1991. The oversized cards measure approximately 2 7/8" by 4 1/4" and feature on the fronts color action player photos with white borders. The set can also be found with blank backs. The cards are skip-numbered by uniform number and checklisted below accordingly.