Series 815 Silver Special FVTS series stands for "free vibrating top system".
Hannabach manufactures special strings for guitars with the "free vibrating top system". Dieter Hopf developed this system in 1980, it refers to a bridge that is not fixed to the guitar body. The bridge is "free" (similar to a violin) and the tension of the strings keeps it in place.
Available as complete sets in either Medium or High tension.
Made for instruments with a scale length of 65cm/25.5".
Made in Germany