From Martin:

"The 000-15M pairs Martin’s Auditorium body with all-solid mahogany construction for a warm, focused sound and a smooth, balanced feel. It features a mahogany top, back, and sides, non-scalloped spruce X-bracing, and a traditional satin finish that gives it a natural, broken-in look and feel. The longer 25.4" scale length adds punch and clarity, while the 1 11/16" nut width and Modified Low Oval neck profile offer easy playability across styles. The East Indian rosewood fingerboard includes diamond and square abalone inlays, and nickel open-gear tuners complete the classic look. A softshell case is included, and optional electronics are available for players who want to plug in."

Dark Mahogany, Satin finish, 000-14 Fret body shape, Solid Mahogany top, Multi-stripe Rosette, Non-scalloped X bracing, Solid Mahogany back and sides, East Indian Rosewood fingerboard with the Abalone short pattern Diamond and Squares position markers on a modified low oval w/standard taper shaped Mahogany neck, 25.4" scale length, 1 11/16th” nut width, Open gear tuners, With the Martin soft case