The 1991 Pro Set Inaugural World League Football Factory Box Set includes 150 sealed cards featuring various players from the World League. This vintage set, manufactured by Pro Set in the United States, includes standard-sized cards made of card stock. The set caters to football enthusiasts and collectors looking for original sports trading cards from the 1991 season, with a focus on the inaugural World League event. With no autographed cards included, this base set offers a glimpse into the history and players of the World League during its first year.