This bat is signed by 10 Hall of Fame sluggers. Half of the signers have career batting averages equal to or over .300, and two of the signers (Willie Mays and Harmon Killebrew) are in the Major League's Top 10 for career home runs. Baseball bat signed: "Brooks Robinson," "Billy Herman", "Enos Slaughter", "Lou Brock", "Duke Snider", "Lou Boudreau", "Harmon Killebrew", "Willie Mays", "Willie McCovey" and "Johnny Mize". This collectible bat comes with a certificate of authenticity.