The sides and backs of the APX20D are sycamore, and it has a solid spruce top. The neck is African mahogany with an ebony fingerboard. The D suffix indicates a slightly deeper body than other APX guitars: the body depth is 90mm (neck side), 100mm (bridge side) with a 12mm round back bulge. It has a unique asymetrical oval shape soundhole with an asymetrical bridge.