[quote name='Dingus' timestamp='1393769970' post='2384130']
I would think that Elixirs are not really likely to wear your fingerboard significantly less than uncoated rounds. The coating is so thin that it is unlikely to prevent the usual abrasion. What's more, the fact that they are stainless steel means that they are not really that suited to fretless playing, both tonally and in terms of the extra wear that steel tends to inflict on the fingerboard. If you are going to use rounds then they should at least be nickel plated because it tends to be a little kinder to the board, although nickel rounds will still wear it out eventually.
Some folks think that if you use strings with smaller/ narrower windings that it wears the frets or fretless fingerboard less , but such strings are hard to find. Thomastic Jazz Rounds are nickel with smaller than average windings, but they are a very unusual light gauge and are quite expensive, but then again the Elixirs you were considering aren't cheap either, so maybe you could look at them as an option . The Thomastics are a remarkable sounding string and would be great on a fretless, providing you could live with their low tension -feel. Another option would be something like D'Addario XL's , which are relatively inexpensive, sound great and are a popular choice for a lot of fretless players, or the excellent but more costly DR Sunbeams, which are what I use on my fretless . Any of those strings would probably be more suitable than stainless steel Elixirs.
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I thought Elixir strings were nickel ?
I've got Status hotwire flats on mine, they sound really nice. I was put off the Thomastiks by the price and huge great B string .