This tailpiecehanger BOIS D'HARMONIE is made of textile cord with Kevlar fibres. It is very stable and shows explicitly sound improving characteristics.
The ends of the tailpiecehanger are savely fixed with a square knot, so you can vary its length very easily. Please keep in mind that the tailpiecehanger expands itself a little bit due to the tension of the strings. Thus the length possibly has to be corrected once more.