From Martin:

A three-piece back, bound neck, and body that’s wide like a jumbo and thin like a 000, for a sound as distinctive as those who play it. East Indian rosewood and spruce work with scalloped bracing to produce a tone that’s big, balanced and ideal for studio recordings. Enclosed gear tuners and a modified low oval neck with narrow taper offer superb playability.

Natural, M-14 Fret (0000-14 Fret) body shape, Solid Spruce top, Forward shifted scalloped X bracing, Multi-stripe Rosette, Antique White binding with the multi-stripe top/ back/side inlay, Three piece solid East Indian Rosewood back and solid East Indian Rosewood sides, Style 35 back purfling, Ebony fingerboard with the Style 38 Mother of Pearl position markers on a modified low oval w/high performance taper shaped select hardwood neck,25.4 scale length, 1 3/4″ nut width, With hardshell case