XL Pure Nickel is our vintage electric string set, designed to embody the vibe of the ‘50s. In that early era of electric guitar, pure nickel was the main alloy used in electric guitar strings. Made with a high carbon steel core and pure nickel wrap wire, these electric strings revive the rich, clean tones heard in early blues, rock & roll, and country music. Our lightest gauge of Pure Nickel strings, this 09-41 Super Light set is easy to bend and very flexible.