EXP coated guitar strings provide a built-in barrier against corrosion and wear and give a natural, round wound feel and extra-bright tone that lasts three to four times longer than traditional guitar strings. A micro-fine layer of EXP Coating is bonded to the phosphor bronze wrap wire, which is then wound onto the hex-shaped core wire. Plain steel E1, B2 with EXP coated G3, D4, A5, E6.