These strings don't just sound great; their micro-thin coating keeps them sounding great for a lot longer than average strings. If you want to keep your guitar tone consistently great day in and day out, put on a set of Elixir Acoustic Nanoweb strings. Their coating actually cuts down on unnecessary finger friction. You'll be amazed at how long they last! Less string changes means having to buy strings less often. Gauges: 012, .016, .024, .032, .042, .053, Core Material Steel.