To the previous poster, this is what the Gollihur page says (which likely answers your question):
"The newly developed strings are, like the original version, metal rope core strings, surrounded by a proprietary nylon wrap. The new 7710T strings are wound with a clear proprietary nylon, which makes for an an even smoother-to-the-touch string with brighter tone and clarity than the original black-tape strings.
Since the black strings were originally designed to emulate gut, but to have a bit more of the feel and sustain characteristics of steel strings, this new version is a bit of a departure - the strings are brighter than the original 7710, so they should offer a whole new experience for the player, tone-wise."