The product is a 1987 Topps Mark McGwire #366 Rookie RC SGC 9 Mint trading card featuring the baseball player Mark McGwire during his rookie season with the Oakland Athletics. This vintage sports trading card is manufactured by Topps in the United States and is part of the Major League Baseball set from 1987. Made of card stock, this standard-sized card is a valuable collector's item for fans of Mark McGwire and baseball memorabilia.