Elixir Acoustic Guitar Strings are covered with an ultrathin, space-age polymer tube that contacts the string on the tops of the windings only. This leaves the all-important winding-to-winding-to-core space free from the fear of the enemies of tone! No more gunk and goo. No more DNA evidence. No kidding. Elixirs are the first major innovation in guitar strings in over forty years, and deliver what they promise: great tone and long life no matter what you put them on or how often you play.