I have a fiddle strung with the octave strings, or at least I did. They cost about $100.00 and had to be imported from Germany. I love the sound of these strings on my violin, BUT you should know that they are very difficult to keep in tune. Many times I'd be playing along and it would just go out of tune, very annoying. Also, be prepared for some new (but well worth it) callouses if you decide to go this route.

Michelle