All are signed on Official American League or Official Major League Selig Baseballs. Includes Alex Rodriguez, Jason Giambi, Chin Ming Wong, Derek Jeter, Bernie Williams, Joe Torre, Ron Guidry, Don Mattingly, Gary Sheffield, Andy Pettitte, Roger Clemens and Tino Martinez. Some have a minor blemish or smudge. All were acquired in person by former Yankees team photograher Micheal Grossbardt. Signatures are overall at minimum "9' on scale of 1-10.