The product is a 12-card lot of 1989 Topps Gary Sheffield Rookie Cup cards featuring the player in his rookie season with the Milwaukee Brewers. The cards are made of card stock and are original vintage pieces. The set includes cards from manufacturers such as Donruss, Score, and Upper Deck, with autograph authentication by Upper Deck. This lot is a collectible item from the Major League Baseball (MLB) World Series, perfect for baseball trading card enthusiasts.