D'Addario EXL115-10P Nickel Wound Electric Guitar Strings, Medium/Blues-Jazz Rock, 11-49, 10 SetsXL Nickel Wound electric guitar strings are the standard against which all other strings are measured. Our best belling electric set, XL Nickel has been revered by players everywhere since 1974. Made with a high carbon steel core and nickel plated steel wrap wire, XL Nickel strings have a bright, versatile tone, ideal for a wide variety of musical styles. 11 49 Medium gauge sets provide increased volume, with slightly more tension and resistance. XL