PhD Strings -- Premium High Density banjolele StringsPVDF, a polymer of higher molecular weight and density than nylon, produces superior volume, sustain and playability. Scientifically optimized by Jason Arimoto, PhD. Endorsed by six-time Grammy Award-winning 'ukulele artist and producer Daniel Ho.All Romero creations instruments are supplied with PHD strings. - Veškeré nástroje od Romera Creations mají natažení PHD struny.SOPRANO / CONCERT STRING SET - LOW G - Banjolele