| D'Addario extra-super light gauging with an exclusive semi-flat surface Centerless ground stainless steel delivers round wound tension with a flatwound feel 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 .008, .010, .015, Stainless Steel .022, .030, .039 |