Try a set of Curt Mangan COATED Acoustic Guitar Strings! Fusion Matched is the trademarked proprietary method that combines the highest quality, 100% made in the USA wire & 100% USA workmanship to produce strings with exacting core to-wrap ratios & tolerances. Phosphor Bronze wire is 92% copper, 7% zinc and 1% phosphorous. The ultra-thin coating resists tarnish & corrosion without compromising tone. Gauges: 35003 - Light 11-15-22w-30-42-52 35004 - Medium/Light 12-16-24w-32-44-54 35006 - Medium 13-17-26w-36-46-56