Yamaha L-Series LS16R Solid Rosewood Acoustic-Electric Guitar w/ Case, Brown Sunburst Hand-selected premium solid Engelmann Spruce top treated with A.R.E. A.R.E. (Acoustic Resonance Enhancement) is an original wood reforming technology developed by Yamaha Solid Rosewood Back & Sides 5-ply neck with high comfort traditional profile SRT Zero Impact (passive) Pickup