Do you use round cores or hex cores?
Both! A lot of companies show a clear bias to one type of core or the other, we use each core type in the situation that we think it works best.
Everyone has an opinion on the round core vs. hex core debate—and everyone you ask will tell you different reasons for why they like either one. To us, hex cores have better flexibility, hold tune better, break less often, and have a clearer, more natural top end. That’s why we use hex cores for all our electric & acoustic guitar strings.
Where we do like round cores is on bass. Round core strings have a smoother, deeper bottom end and seem to resonate better on a bass guitar, so that’s where we use them.