Fender dura-tone strings feature brightness and claritywith extra long life. they are an excellent all-purposestring, whose clear, even tones make them the perfectchoice for most styles of acoustic music.we started with our 80/20 bronze strings and addeda specially applied micro-treatment to make fenderdura-tone strings. this special coating resiststone-killing grime and corrosion, resulting in a stringthat lasts up to five times longer while retaining naturalfeel and clear, full tone.by the way, dura-tone is also an excellent choice forguitars on display that may be subject to humiditychanges or the many hands of numerous players.