Description Product Description Built by Martin in collaboration with Seth Avett of The Avett Brothers, a high-altitude Swiss spruce top is featured for the top of this 14-fret Dreadnought acoustic-electric guitar. Harvested in winter months to produce a lighter-weight wood with better stiffness, this wood features a tight and even grain. This guitar also sports three-piece back composed of East Indian rosewood with a flamed koa center wedge. Seth himself designed the copper snowflake inlay placed in this guitar's ebony fretboard.