Silent Guitar fretboard with 21 frets.
7-string Nylon Silent guitar, scale 648 mm..
Silent guitar Amplified with a Shadow SH Sonic Nanoflex preamp.
Nylon Silent guitar 7-string hand made in Buenos Aires by Luthier Rodolfo Cucculelli.
Ebony guitar peg head and bone nut.
Guitar neck thickness is 17 mm., strings action over frets is 2,3 mm to 4,5 mm for the 7th string.