Elixir Nanoweb Phosphor Bronze Acoustic Guitar Strings 13-56 Medium 16102Not all guitar strings are created equal. Even after just a few hours of play, dirt, sweat, skin oils and other debris will build up between the string's windings, causing corrosion in the metal. The result is a noticeable "deadening" of the string's tonal quality, which can happen very quickly with uncoated strings. Elixir Phosphor Bronze strings begin with anti rust plated plain steel strings that are corrosion resistant. They provide a clean feel