For those of you who want to try roundwounds on your fretless but are concerned about fretboard wear... fret (Pun intended!) no more! A friend of mine turned me onto Elixir strings. What makes them different is that they have a polymer coating on them. It does not interfere with how the string vibrates in any noticeable way. As a result they sound bright as you would expect a roundwound to sound. BTW the string windings are nickel plated steel. The coating has other benfits as well. It helps reduce fret and fingering noise (Great for those like myself with questionable technique) and dirt and sweat don't make their way into the windings, so they last longer. I have them on my fretted bass as well. After a while the polymer coating appears to shed from the exposed part of the winding. It looks like they are molting, but this does not affect the sound. This shouldn't be a problem with a fretless. I installed the hard tension 105 - 45 set on my MIM Fretless Jazz. They are nice and growly with nice bottom definition. They give me a greater range of tone than either the stock Fender Flats that came with the bass or the Thomastik Infeld flats. The TI flats are nice strings, but the nut on my bass is cut out for the larger gauge strings. The gauges that TI flats are available in run on the light side 100-70-56-43 resulting in string with soft tension. They seem to get that upright thing goin' on, but I found them too subdued. So come on and share your experiences with the Elixir Strings!