The product is a 1987 Topps baseball trading card featuring Mark McGwire of the Oakland Athletics. This card is part of the base set and is designated as card number 366. As a collectible item in the sports trading card market, it appeals to fans and collectors interested in the history and players of Major League Baseball, particularly those from the 1987 season. The Topps manufacturer is well-known for producing high-quality sports trading cards, making this a desirable piece for enthusiasts of Mark McGwire and the MLB.