21 single-signed bats from members of the illustrious 500 Home Run Club. Most autographs are on show model bats, and include Mike Schmidt, Ken Griffey Jr., Frank Robinson, Willie Mays, Barry Bonds, Eddie Mathews, Jim Thome, Reggie Jackson, Ted Williams, Ernie Banks, Mark McGwire and Willie McCovey. Many players have included additional notations with their signatures, which include Mickey Mantle "536", Sammy Sosa "500 HR Club", Hank Aaron "755", Eddie Murray "HOF 2003 / 504 HRs", Alex Rodriguez "Youngest to 500 HR", Frank Thomas "500 HRs", Harmon Killebrew "573 HR's, MVP '69, HoF '84, No. 3", Manny Ramirez "500 HRs", and Rafael Palmeiro "500 HR Club".