Martin Retro® strings are the real deal. Not an imitation. With Martin Retro® strings, you get a solid set that delivers a true, consistent tone and sounds like nothing else on the market. Martin’s solid nickel/copper alloy blend offers a reduced pick attack that allows the guitar’s tonewoods to be heard, not overshadowed. Martin’s proprietary Monel wrap wire is naturally corrosion-resistant, so you can play them a long time with nothing to get in the way of your music. Discover your guitar’s true voice. Retro® strings offer increased longevity with a natural, warm tone, and they sound great plugged in.