This is a lighter gauge of gut that has a softer tension than Concert Gut. It is also called Folk Harp Gut. The tone is brighter than Concert Gut but not as bright as Nylon. They seem to be warmer in the lower end and brighter in the higher end. Many pedal harpists see these strings as a welcome change from concert gut and a nice rest for their fingers without compromising the wonderfully warm and rich tone that gut offers. Each string is actually thinner than the corresponding nylon string. For the lower octave bass strings I use the same type of strings as I do with a nylon set.
This is the same stringing used on pedal harps. It has the warmest tone and the firmest tension. If you are a pedal harp player and like the feel of your pedal harp, you might choose these strings. It takes strong fingers to get a lot of sound out of these strings, so beginners should shy away from them unless you know that you will play pedal harp someday. I use the same type of Bass wire combinations for the lower octaves on all of my larger harps, but with higher tension for a model with Concert harp tuning. Concert Gut strings are only to be used on my custom harps, designed and built to support their higher tension.