PSG042 is a .042 gauge ProSteels electric guitar string. Perfect as a replacement string or for creating custom sets. Part of the D'Addario ProSteels string series. D'Addario XL ProSteels utilize a highly magnetic, 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.D'Addario, the world's largest manufacturer of musical instrument strings, is known as The Players Choice with a reputation for unsurpassed quality and consistency. All D'Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.