according to the Elixir string guide that comes with all new guitars, its an option for 200 series and standard on 300 series guitars. Guess its up to you if wan to use them. Elixir Lights are 12,16,24,32,42,53 HD Lights are 13,17,25,32,42,53 bolder highs, fuller lows. I use both. 12's on my mini hog I had converted when I bought it and 13's HD on my 312ce.