This is a 1999 Topps Power Brokers Refractor #PB1 Mark McGwire trading card graded as PSA 9 Mint. This card features McGwire from the St. Louis Cardinals in the Major League Baseball (MLB) and is refractor of the original Power Brokers insert set by Topps. With a low population of 14 and only 14 graded higher, this card is a sought-after collectible for fans and collectors of baseball memorabilia, especially those interested in vintage sports trading cards.