D'Addario 042 Single Nickel Wound Guitar Strings are round wound with nickel-plated steel for a distinctive, bright tone. Features Nickel wound electric guitar strings Round wound with nickel plated steel for distinctive bright tone Perfect as a replacement string or for creating customized sets All D'Addario strings are designed, engineered, and manufactured in the USA Specifications Coating: Uncoated Number Of Strings: 1 Set Type: Singles Wrap Material: Nickel-Plated Steel Gauge: .042