D'Addario EXL115W combines the popular XL115-gauging with a wound 3rd string, offering the ideal combination of full, beefy tone, flexibility and long life. XL Nickel Wound, D'Addario's most popular electric guitar strings, are precision wound with nickelplated steel onto a carefully drawn, hexagonally shaped, high carbon steel core. The result, strings with long lasting, distinctive bright tone and excellent intonation, is ideal for the widest variety of guitars and musical styles.