Guitar strings for a six string electric guitar. D'Addario pioneered the use of nickelplated steel for the electric guitar. Today, D'Addario XL Nickel Round Wound electric guitar strings are the string of choice for rock musicians worldwide. D'Addario electric guitar strings deliver unsurpassed reliability set after set. Choose D'Addario XL Nickel Round Wound electric guitar strings for their distinctive bright sound and excellent intonation. Gauges - 10 14 .009 12 18 26w.