Elixir Strings are covered with an ultra-thin, 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!Nanoweb coating permits strings with the feel, bright tone, and punch of traditional strings. Elixirs are the first major innovation in strings in over 40 years, and deliver what they promise: great tone and long life no matter what you put them on or how often you play. Most players report that Elixir Strings keep sounding great 3 to 5 times longer than ordinary strings.Gauges: 45-65-85-105.