"ECG24, D'Addario's best selling gauge of flatwound strings, delivers a balance of smooth feel, warm/mellow tone and optimal tension, ideal for traditional jazz, rockabilly twang, R&B and some pop/rock styles.- D'Addario's best selling flatwounds offers balance of smooth feel and warm, mellow tone- 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 .011, .015, Nickel Wound .022, .030, .040, .050- Environmentally friendly, corrosion resistant packaging for strings that are always fresh"