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EPS590's offer a super-bright, crunchy tone and corrosion resistance for longer string life. D'Addario XL ProSteels utilise 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. If you're looking for more crunch, bite, and sustain, ProSteels are the choice for you.