Classical, Flamenco Guitar Machine Heads tuners from Der Jung -This is a classy machine head set made by Der Jung for Classical or Flamenco guitar. The DJ403SN is made of heavy duty metal, with a polished steel finish. It includes 6 machine heads with oval black buttons, made of an ebony-like material and reinforced with inside screws for a softer and more accurate tuning. Also included are matching color screws for perfect installation. The DJ403SN s have 35mm rollers space and 110mm total length, 1;14 Gear Ratio.