D'Addario EXPs are the most natural-sounding, longest-lasting coated strings available. EXP Coated Technology starts with the highest quality wrap wire materials, precision drawn and micro-coated on our advanced proprietary machinery. Strings are then wound normally, delivering tone and feel identical to D'Addario's world renowned XL electric strings, with a minimum of 4 times more life. You won't believe they are coated! EXP115 delivers all the tone and performance of our best-selling EXL115 set, with 4 times more string life. 11-49 is preferred for its heavier tension and beefier tone.