EXL110-7, D'Addario's best selling 7-string set, offers the ideal combination of tone, flexibility and long life. The standard for most 7-string electric guitars.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. D'Addario's best selling 7-string electric guitar set Round wound with nickelplated steel for distinctive bright tone Environmentally friendly, corrosion resistant packaging for strings that are always fresh Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .010, .013, .017, Nickel Wound .026, .036, .046, .059