D'Addario EJ67 strings are excellent for both electric and acoustic mandolin playing. The strings of the J67 mandolin are wrapped in nickel-plated steel, known for its distinctive bright tone and excellent projection. Legends like David Grisman, Ricky Skaggs, Ronnie McCoury, Doyle Lawson, Rhonda Vincent, Mike Marshall, Adam Steffey, and others trust D'Addario strings for their natural acoustic sound and reliable performance. They are made from high-quality plain steel, stainless steel, nickel-plated steel, and phosphor bronze, and are available in a variety of gauges. J67 strings are ideal for electric or acoustic mandolin playing. Loop-end construction for universal fit. Round-wound with nickel-plated steel for a distinctive bright tone. Made in the USA for the highest quality and performance. String gauges: Plain steel .011/.011, 014/.014, Nickel wound .025/.025, .039/.039.