Along every step - ball-ending to winding to coiling - Martin insists on consistent specs. Their best guitar-playing craftspeople regularly get out their picks and blind-test Martin strings against the competitor's. Martin then weighs all results, along with players' comments, to help make brighter, fuller-bodied, longer-lasting strings that live up to the Martin sound.

Martin's remarkably super-pure bronzed steel core in the SPs provides higher tensile strength and elongation. Simply said, the SP strings provide greater durability (fewer breakages) without sacrificing tone or playability so you can stay in tune and play longer.

The 80/20 Bronze alloy provides maximum billiance out of the box.

MSP3050 guages:  .011/.015/.023/.032/.042/.052