The 1991 Leaf MLB Baseball Series 1 Unopened Foil Pack Box contains 36 packs of trading cards featuring players like Ken Griffey Jr from the New York Yankees. These vintage baseball cards are made of card stock and are in standard size. As part of the 1991 Leaf set, this box offers a total of 540 cards, making it a valuable addition to any sports memorabilia collection. The unopened foil packs add to the excitement of uncovering hidden gems from the baseball league that year.