Hello everyone, I want to play with Thomastik-Infeld Acousticore Acoustic Bass Strings - 4 String Set on my fretless bass. My question is that are they like flatwounds in terms of durability? I mean everyone knows that with flatwound strings, the one can play many years without changing them like roundwounds and they still stay playable. Does this concept apply to acousticore strings also? Or are they like roundwounds? So after awhile they go dead or dull so they have to be changed regularly?