The 1990 Topps Ken Griffey Jr #336 Mariners Rookie Cup is a standard size Major League Baseball trading card featuring the rookie card of Ken Griffey Jr. It is an original card manufactured by Topps in 1990, made of card stock, and is part of the Topps series. The card is from the English language and depicts Griffey Jr. during his time playing for the Seattle Mariners. This collectible item is a valuable addition for fans and collectors of baseball memorabilia, especially those interested in vintage and rookie cards.