John Mayer’s Martin DM3MD Dave Matthews Model

This guitar was used by John to record the entirety of the Room for Squares album and during the 2001 tour.

The guitar is a limited edition Dave Matthews signature model from Martin. According to the official specs, it features a 14 fret dreadnought body with solid spruce top and solid East Indian rosewood back and sides, solid mahogany neck with ebony fretboard, and grained ivoroid body binding.