The product is an 83-card lot featuring Mark McGwire baseball trading cards from various brands such as Zenith, Finest, Upper Deck, Topps, Certified, and Brilliants. The cards are standard size and made of card stock, representing Major League Baseball players and teams. The lot includes base cards and inserts from various games and photoshoots, all in English and manufactured in the United States. This collection is perfect for fans of Mark McGwire looking to add a variety of cards to their sports memorabilia collection.