Ernie Ball Ernesto Palla concert quality classical guitar treble strings are made of black nylon monofilament. Gold wound basses are made of 80/20 bronze wrapped around a nylon multifilament core providing a smooth, rich tone. These strings feature ball end construction for faster, easier installation over traditional tie-end strings. All Ernie Ball strings are precision manufactured to the highest standards and most exacting specs to assure consistency, optimum performance, and long life. Gauges First .028, Second .032, Third .040, Fourth .030, Fifth .036, Sixth .042 – Medium tension