The 1998 Pinnacle Inside - Behind the Numbers Ken Griffey Jr #1 trading card is a collectible item featuring the legendary baseball player Ken Griffey Jr from the Seattle Mariners. Manufactured in 1998 by Pinnacle, this card is part of the Behind the Numbers insert set and is made of card stock. This standard-sized sports trading card is a must-have for baseball fans looking to add a piece of MLB history to their collection.