D'Addario EHR310 Half Round Electric Guitar Strings, Regular Light, 10-46 D'Addario's most popular string gauge with an exclusive semi-flat surface Centerless ground stainless steel delivers round wound tension with a flatwound feel 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 .010, .013, .017, Stainless Steel .026, .036, .046