D'Addario's most popular gauge for heavy strumming?? flat-picking and resonant?? projecting tone</br>EXP Coated phosphor bronze for warm?? bright?? well balanced acoustic tone and 4 times more life</br>Includes D'Addario's exclusive NY Steel?? the same high carbon steel found in the NYXL series for unprecedented strength and pitch stability.</br>Environmentally friendly?? corrosion resistant packaging for strings that are always fresh</br>String Gauges: Plain Steel .013?? .017?? Phosphor Bronze Wound .026?? .035?? .045?? .056</br></br>Product Description</br></br>An ultra-fine layer of EXP Coating is bonded to the phosphor bronze wrap wire which is then wound onto the hex-shaped core wire. The result is a built-in barrier against the corrosion and wear that can quickly sap the life out of your strings and your sound. EXP coated phosphor bronze strings have a natural round wound feel and sound fresh and bright with a "tone" that lasts three to four times longer than traditional guitar strings.</br><br/>http://www.amazon.com/gp/product/B0002E3CJAACPS-720 CP