I have played Martin strings on all my guitars for years and have settled on Acoustic SP's. They last well and stay in tune. I use Custom Lights on all my guitars to keep a consistency of feel when I play. Martin strings are always high quality.
Since fitting these strings (I use a Martin D28) the guitar has had approx' 6 hours of playing out. Mostly pub work. Because I am a somewhat heavy handed rythm player it is my usual habit to re-string after only 3 hours of playing out. The MSP4050 strings, however, still sound very clean and crisp and I expect to get at least another 6 hours of play. I am more than pleased with them.
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