John Mayer’s Ernie Ball Music Man 25th Anniversary
This guitar was seen during the 2010 Battle Studies World Tour on various dates primarily on gigs played in Australia and Japan. From the photos available the guitar appears to be black, but it seems that all of the 25th Anniversary models were produced in dark red. John’s guitar was then either a custom-made model and one of the few to be finished in black (likely the case), or it only appeared to be black on those photos but was in reality dark red.
The Ernie Ball Music Man 25th Anniversary model is equipped with two DiMarzio custom humbuckers mounted on top of a chambered basswood body with a figured maple top with white binding. John particular model is fitted with a rosewood fretboard with 22 frets and 12″ radius (flatter than John’s Strats).
Allegedly, the guitar was used to record some of the stuff on the Battle Studies but there’s no official word from John on this.