Martin Authentic SP strings are designed with the needs of active musicians in mind, so they must be able to withstand the rigors of constant gigging and rehearsals. They are based on a steel core with a tin coating for increased resistance to corrosion, and perfect sound characteristics are guaranteed by the silver-plated copper wrap. In addition to high durability and great sound, you can rely on excellent playability and 100% tuning stability in all situations.
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