Fender Dura-Tone strings feature brightness and clarity with extra long life. They are an excellent all-purpose string, whose clear, even tones make them the perfect choice for most styles of acoustic music.Fender started with their 80/20 bronze strings and added a specially applied micro-treatment to make Fender Dura-Tone strings. This special coating resists tone-killing grime and corrosion, resulting in a string that lasts up to five times longer while retaining the natural feel and clear, full tone.class="k-br"