Strings for electric guitar. EPS520's offer a super-bright, crunchy tone and corrosion resistance for longer string life. D'Addario XL ProSteels utilize an exclusive corrosion-resistant steel alloy that delivers super-bright tone without shrill overtones. They offer a palette of harmonically rich, brilliantly penetrating highs combined with pronounced, tight-and-tough lows. Super Light gauge with brighter, crunchier tone and increased sustain. Gauges: . 009, . 011, . 016, . 024, . 032, . 042