- .008o .010o .015o .021w .030w .038w
D'Addario ProSteels Electric Guitar Strings are the brightest guitar strings D'Addario offers. D'Addario Pro Steels are made using an exclusive corrosion-resistant steel alloy that makes for a super bright tone without shrill unwanted overtones. D'Addario ProSteel Guitar Strings offer a palette of harmonically rich, brilliantly penetrating highs combined with a pronounced tight and tough low end. If you want a guitar string that delivers more crunch, bite, and sustain then D'Addario ProSteels are for you.