All 21 signed baseballs are official American or National League balls that include several all-time greats: Mantle, T. Williams, Koufax, DiMaggio, Drysdale, Musial, Ford (2), Ryan, Berra, Seaver, Gibson, Bench, Killebrew, F. Robinson, Feller, Kaline and McLain. All are single signed except the following two: 1) 1997 Mariners All-Star ball with Griffey Jr., R. Johnson, A-Rod, E. Martinez and Joey Cora. 2) 500 Home Run club - 6 sigs: Mays, Aaron, Banks, Schmidt, R. Jackson and Mathews. The signatures rate 7/10 and the condition is EX-MT+. The vast majority are certified including UDA and Steiner.