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D'Addario XL Pure Nickel strings look back to the early '50s, when nickel was the primary alloy found in electric guitar strings. Into the '60s, these pure nickel strings would be supplanted when guitarists required brighter tone and enhanced magnetic properties/characteristic of the D'Addario XL nickelplated steel string line, but pure nickel aficionados remained and their numbers have grown. They long for classic, mellow timbres that define many genres including blues, classic rock, rockabilly, and more.