D'Addario offers 10 sets of strings in one convenient, cost-effective & environmentally friendly multipack. Each set is sealed in separate VCI bags for corrosion resistance, so they're fresh when you're ready to restring. XL Nickel, D'Addario's most popular electric guitar strings, are precision wound with nickel-plated steel onto a carefully drawn, hexagonally shaped, high carbon steel core. The result is strings with long lasting, distinctive, bright tone and excellent intonation, ideal for a wide variety of guitars and musical styles. XL Nickel are our best-selling electric guitar strings, revered by players since 1974. Nickel-plated steel wrap wire provides a bright, versatile electric guitar tone, great for a variety of musical genres. Like all D’Addario electric guitar strings, XL Nickel are made with our proprietary Hex-Core, ensuring perfect intonation, consistent feel, and reliable durability. XL Nickel sets have a code on the recyclable VCI bag, which you can register to earn Players Circle points. XL Nickel electric guitar strings are made in the USA—drawn to our exacting specifications at our New York production facility.