Sigma 000M-15L LeftHanded Acoustic Guitar The Sigma 000M-15 is a acoustic guitar with matched tonewoods. The solid top, back and sides as well as the glued-in neck of the Sigma 000M-15 classical acoustic guitar consist of beautifully looking mahogany, which features a well-balanced while warm sound. The fingerboard is made of Indian rosewood and therefore adds some attack to the overall sound of the Sigma 000M-15, so every note is played very defined. Original Grover tuners and great price-performance ratio round out the Sigma 000M-15.