Here we have the Martin OMJM John Mayer signature acoustic. It’s a great-looking guitar with an OM-style body shape and a natural gloss finish. It’s made with an Englemann spruce top, East Indian rosewood for the back and sides, and a Spanish cedar neck with an ebony fretboard. Features include 20 frets, an ebony bridge with compensated Tusq saddle, nickel Gotoh open-gear tuners, a 25.4″ scale length, mother of pear fretboard position markers, and Martin Gold Plus Natural 1 electronics for amplification.