Take your collection of New York Yankees memorabilia to the next level by adding this Andy Pettitte, Derek Jeter, Jorge Posada and Mariano Rivera autographed Louisville Slugger Game Model Bat. Known as the Core Four, they each played significant roles in the team's dynasty run of four World Series championships from the late-1990s to early 2000s. These legendary Yankees players were also all still together for the 2009 World Series title. Whether displayed in your home or office, this hand-signed bat is the perfect way to highlight the incredible careers of Andy Pettitte, Derek Jeter, Jorge Posada and Mariano Rivera.