Recording King Tonewood Reserve Koa 12-Fret 000Recording King Tonewood Reserve Koa 12 Fret 000 With deluxe hardshell case?? Solid Koa Top, Back & Sides Ebony Fretboard & Pyramid Bridge Abalone Diamond Fretboard Inlay Bone Nut & Saddle The ROS 729's elegant design is highlighted by the all solid Koa construction, producing a rich, clear and resonant tone. Koa is a harder wood than spruce, with fundamental tones that are very focused, without lots of overtones. The 000 12 fret body provides a