The only strings I use with my Martin DX1AE. The quality is excellent and the sound even better. When they are new the sound is crystal clear and almost sounds like 12 string when compared to old strings. These strings also last a long time. I have had the same strings in my Martin for a about half a year and I play nearly every day with that guitar. These are a bit more expensive than other Martin strings, but when the sound and quality are this good I'm happy to pay that price. I can't imagine playing my Martin with any other strings.
These are the factory issue strings which came with my X series Martin guitar and I love them. They sound great and last for ages. I change them about once a year. Of course over time they lose a bit of that fresh bouncy sound which a new set has, but they still sound good a year later. I am a heavy strummer and I've never broken one yet.
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