.049 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. .