D'Addario ECG26 Chromes Flat Wound Electric Guitar Strings, Medium, 13-5; ECG26, D'Addario's heaviest gauge flatwound set, delivers; smooth feel, warm/mellow tone and maximum tension, ideal for traditional jazz playing; D'Addario's heaviest gauge; flatwounds delivers smooth feel, warm/mellow tone and maximum tension Ribbon wound and polished for ultra-smooth feel and warm, mellow tone 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 Flat Wound .026, .035, .045, .056; D'Addario; Chromes are the industry standard; flatwound guitar strings. They deliver; round, full low end without losing punch, making them ideal for jazz players; all types. Wound with flattened stainless steel ribbon wire, then polished; unparalleled smoothness, it's; wonder that; Chromes are the world's most popular flatwound strings.