The product is a sealed pack of 25 baseball cards from the 1991 Donruss set, featuring Mark McGwire on the front. The cards are standard size and belong to the Major League (MLB) league. Manufactured by Donruss in 1991, this pack of sports trading cards is a collector's item, focusing on baseball fans and enthusiasts looking to add to their collection of sports memorabilia. Perfect for fans of Mark McGwire or those interested in baseball history from the 1990 season.