Elixir 16182 Nanoweb HD Light Phosphor Bronze Taylor 13/53 Set for Acustic Guitar with Nanoweb ultra thin coating and Anti Rust plain steels technology .They provide a clean feel and bright, vibrant tone. This results in a long-lasting, rich tone with more audible high-frequency harmonics. Taylor Guitars worked with Elixir Strings to create a custom string set that brings bolder highs and fuller lows to the Grand Concert and Grand Auditorium guitars. Elixir Acoustic HD Light Phosphor Bronze Strings with NanoWeb coating deliver bolder highs and fuller lows with a balanced voice across all the strings making them ideal for narrow bodied guitars. Gauges:013-017-025w-032w-042w -053w.