Acoustic Phosphor Bronze with Nanoweb Coating Custom Light 11-52 16027Elixir Strings Acoustic Phosphor Bronze with NANOWEB Coating deliver distinctive phosphor bronze warmth and sparkle together with extended tone life. Only coated string brand to protect the entire string with an ultra thin coating, keeping gunk out of the gaps between the windings Extended Tone Life players report their tone lasts longer than any other string, uncoated or coated Consistent performance and tone ready to play whenever you are Smooth