“Senza” (meaning ‘without’) relates to the section of string between the bridge and the saddle of the tailpiece.
As with the pure gut strings in days gone by, the modern wound Senza string, with synthetic or metal core, runs from the nut of the fingerboard over the bridge, down to the saddle of the tailpiece without textile or synthetic windings.
This has the immediate effect of creating pure fifths behind the bridge, which in turn produce additional harmonics.
The method of fastening also follows the model of the gut string, with a knot securing it inside the slot of the tailpiece.
All other means of securing the string, such as a ball or loop end, incurred an unwanted extra winding. Hence the knot being the only solution for avoiding this.
Setting the distance between the bridge and the tailpiece-saddle is vital. After many experiments, I found that the ideal result is not achieved by a repeating of the tuning of the strings themselves.