The 1993 Studio Superstars On Canvas 1 Ken Griffey Jr Seattle Mariners trading card is a standard-sized baseball card featuring the legendary player from the Seattle Mariners. Manufactured by Leaf in 1993, this card is part of the 1993 Studio set and is made of 20 Pt. card stock. It is a base set insert card with a professional grade from Professional Sports Authenticator (PSA), making it a valuable collectible for any baseball card enthusiast. With its authentic design and historical significance, this card captures a moment in baseball history and pays tribute to the talent of Ken Griffey Jr.