| D'Addario popular jazz medium 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 .013, .017, Stainless Steel .026, .036, .046, .056 |