NYXL Nickel wound electric guitar strings are part of our enhanced NYXL string series. Perfect as a replacement string or for creating custom sets. NYXL electric guitar strings are precision wound with D'Addario's reformulated nickel plated steel windings. Greater magnetic properties give NYXLs higher output and enhanced midrange frequency response for more presence and crunch. .039 gauge NYXL Nickel Wound electric guitar string Round wound strings with enhanced mid-range frequency response in the 1 - 3.5 kHz range – more presence and crunch to cut through the mix Improved tuning stability compared to traditional nickel wound strings - get in tune faster, stay in tune better Perfect as a replacement string or for creating customized sets Made in the U.S.A. for the highest quality and performance