The product is a collection of 20 original sports trading cards featuring Don Mattingly of the New York Yankees. These vintage baseball cards are made of card stock and are from the Major League (MLB). Signed by Don Mattingly himself, these standard-sized cards are a must-have for any baseball card collector or fan of the New York Yankees. The cards commemorate Don Mattingly's time with the team and are a great addition to any sports memorabilia collection.