The product is a set of six Beckett Baseball Price Guides from the years 1991-1998, featuring iconic players such as Ken Griffey Jr, Rickey Henderson, Mark McGwire, and Jackie Robinson. These vintage price guides are original publications by Beckett Media, focusing on the MLB World Series and the sports trading card industry. Each paperback guide is in English and includes contributions from Beckett, along with autograph authentication from Beckett Authentication Services (BAS). Perfect for collectors and fans of baseball memorabilia, these price guides provide valuable insights into the world of sports trading cards.