On their website, Worth recommends this string (CM) for soprano (and concert) ukulele. So I choose this set for my Kala travel soprano. I was pleasantly surprised. The tension is just right, not too high, not too low, so the instrument is able to breathe. The sound depends on the qualities of your personal instrument, but I thought this was a pretty neutral string, it helped the instrument to sound like itself, while presenting the typical qualities of the carbon material: open sound and good sustain. I think this string will work for instruments previously strung with Aquila Nylgut. Just see which one you like better. These sets seems expensive, but the strings are double length. Cut them in half and serve two ukes!