Elixir strings are anything but ordinary strings! They have a unique Goretex coating that gives them a lifespan 4 to 5 times longer. Touch, compare, and you will find that they sound! For extraordinary guitars, extraordinary strings! Pleasant and clean strings that remain a perpetual source of inspiration. The special system of Elixir strings prevents string oxidation. Dead skin residues and the natural grease of the hands usually deposit between the string grooves. This phenomenon not only slows down vibrations but also accelerates corrosion. After extensive research, Elixir wrapped its strings with a coating that forms a polymer tube thinner than a hair. The strings are thus protected and stay at their best! Extra Light: E 010B 014 G 023w D 030w A 039w E 047w