Cleartone EQ s are the first Acoustic Guitar Strings that blend a variety of metals into a single set to highlight your guitar s frequency response. Designed to mimic a perfect EQ setting , each wound string utilizes a different alloy to enhance that string s natural frequencies. These strings begin with a 99% copper-bronze for the Low E to increase bass response. Phosphor Bronze is used on the A D string to accentuate the mid range while maintaining a robust low and high end. Cleartone selected 80/20 for the G string because of its bright characteristics and ability to cut through the mix. Put together, Cleartone EQ s produce an exquisitely balanced tone that mimics a perfect EQ setting by combining all the best characteristics of Phosphor bronze, 80/20, and Copper-bronze into a single set. A world FIRST!Designed to mimic perfect EQ settingWorlds first set with Hybrid Metal Acoustic technologyFeatures Cleartone's patented EMP treatment for extended lifeTakes the guesswork out of 80/20 vs. phosphor bronzeHighlights your guitars natural frequency responseString Gauges: 11, 15, 24, 32, 42, 52Cleartone Item No. 7811Get yours today; with the security of our many decades of experience and Sam Ash Direct efficient order processing, your satisfaction is guaranteed!