ECG24-7, based on the gauges of D'Addario's best selling gauge of flatwound strings with an additional low B 7th string (.065), 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. Designed specifically for 7-String electric guitars. D'Addario Chromes are wound with flattened stainless steel ribbon wire which is polished to an incredibly smooth surface. Chromes deliver a distinctive damped but tone-rich sound that only flatwounds can produce. D'Addario Chromes are the world's most popular flatwound strings. Based on the top selling ECG24 set with an additional 7th String included. 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, Stainless Steel Flat Wound .022, .030, .040, .050, .065