ESXL110 strings are constructed with ball ends on both ends for use on double ball-end guitars. They are precisely engineered and wound to Steinberger specifications. XL Nickel Wound, 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 a long-lasting, distinctive bright tone and excellent intonation, ideal for a wide variety of guitars and musical styles. The double ball end design is manufactured to Steinberger specifications. They are round wound with nickel-plated steel for a distinctive bright tone. The environmentally friendly, corrosion-resistant packaging ensures that the strings 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.