I have a set of medium gauge Heliocore Hybrids that I'd like to trade for a set of Superflexibles. I'd also be into a gently used set of Dominants. I'm more interested in a trade but I'd sell them for $50.00 shipping included. The Heliocore strings were on my bass for one month with a few gigs and sessions, but they still have life in them. PM me if interested.