D'Addario J7502 is a .016 gauge plain steel second string, an ideal replacement string for the J75 Phosphor Bronze Mandolin Set. D'Addario mandolin strings are trusted by legends like David Grisman, Ricky Skaggs, Ronnie McCoury, Doyle Lawson, Rhonda Vincent, Mike Marshall, Adam Steffey, and more, for their natural acoustic tone and reliable performance. They are made from the highest quality plain steel, stainless steel, nickel plated steel and phosphor bronze and are available in a wide variety of gauges. J7502 is a .016 gauge plain steel mandolin first string Loopend construction for universal fit Superb, long-lasting tone Made in the U.S.A. for the highest quality and performance