I was informed of Rotosound strings by a rather reliable and trustworthy source. They are lovely strings which retain their bright sound for some time. The wound strings are stripped bare at the ends so that the thing core of the string touches the bridge which provides a rather lovely sound on Semi-Acoustics with pickups in the bridge. My problem with Rotosound strings however are that for my playing (I can really get into playing songs), the strings can break easily. Which isn't ideal. However for those who play mainly soft finger picked songs, this strings are pretty perfect.