Elixir Nanoweb Phosphor Bronze Acoustic Guitar Strings (Medium 13-56) with Nanoweb coating deliver distinctive Phosphor Bronze warmth and sparkle together with extended tone life. Elixir is the only coated string brand to protect the entire string with an ultra-thin coating, keeping gunk out of the gaps between the windings. Players report their tone lasts longer than any other string, uncoated or coated, resulting in consistent performance and tone that is ready to play whenever you are. Smooth feel that is easy on your fingers and enhances playability reduces finger squeak – good for both performance and recording. With less hassle and expense of frequent string changes, spend more time making music.