Riff...sorry can't help you, but somewhere on the internet you can probably get a good estimate. I owned a couple ...and they were really cool pieces...Very pronounced highs and lows in the EQ system. Started on 4's, but now I'm stuck on 5 strings. Had a white 5 most recently, and would LOVE to get it back. If I see it again, I will make it happen. Michael Manring had one (4 fretless) on the back of one of his early CDs ...Hoping the Kestrels and Kingfishers come out in 5 soon...