- Accompaniment- f'-3 Single String / Concert Zither Bergfee Steel (red)Munich and Vienna TuningScale length: 41,5 cmCONCERT ZITHER Bergfee Steel Red is our strongest zither string. It is made offinest steelwith very little silk (on the steel core), wound with a fine silver plated wire. Powerful in tone (stronger and more aggressive sound than Nylon Blue). This string is also great for acoustic playing and electromagnetic sound transmission (sound pickup).<br />