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Medium gauge Martin SP Lifespan Phosphor Bronze Acoustic Strings are treated to repel dirt, oil, and other residue that can build up from playing and cause your tone to dull. Unlike other string treatments, the SP Lifespan strings feel and play like standard guitar strings, so you don't have to sacrifice playability for long lasting tone. These strings use phosphor bronze for a deep and powerful tone which is warmer than 80/20 bronze.