Elixir 16102 Phosphor Bronze Nanoweb Medium Acoustic Strings 13-56 Elixir 16102 Phosphor Bronze Nanoweb Medium Acoustic Strings 13-56.  The ELIX16102 Phosphor Bronze Nanoweb Medium Guitar Strings 13-56is a pack of 6-string acoustic guitar strings, made from phosphor bronze with a Nanoweb coating and come in a medium gauge of .013-.056. These strings deliver distinctive phosphor bronze [...]