Furch Green Plus SW guitars have a soundboard made from a high-grade Sitka spruce, the back and sides are made from high-quality black walnut. The entire body is protected by our proprietary Full-Pore High-Gloss Finish, developed to enhance the resonance qualities of tonewoods. The finish has a 95% light reflection factor. This combination of finish and tonewoods translates into a beautiful musical sound across the entire tonal range with pleasing balanced mids and transparent sparkling highs.