Myrtlewood Nylon String Classical multi-scale w/Kasha style radial bracing. The radial bracing on the underside of the top is designed to reinforce production of bass tones by the bass half and treble tones by the treble half of the top surface for a big sound. This system allows the bridge to move in both a rotary as well as up and down manner, adding sustain and richness of harmonics. The backs complex bracing system allows it to move like a diaphragm of a speaker, reinforcing the bass, middle and treble notes.