· BESTSELLING SET – XL Nickel are our best-selling electric guitar strings, revered by players since 1974.· VERSATILE, BRIGHT TONE – Nickel-plated steel wrap wire provides a bright, versatile electric guitar tone, great for a variety of musical genres.· FOR THE ULTIMATE PERFORMANCE – Like all D’Addario electric guitar strings, XL Nickel are made with our proprietary Hex-Core, ensuring perfect intonation, consistent feel, and reliable durability.· EARN REWARD POINTS - XL Nickel sets have a code on the recyclable VCI bag, which you can register to earn Players Circle points.· MADE IN THE USA – XL Nickel electric guitar strings are made in the USA—drawn to our exacting specifications at our New York production facility.