There s one surefire way to give your guitar the tone it deserves. It starts and ends with Martin's Authentic Acoustic strings. C.F. Martin & Co. may be known mostly for their guitars, but they also make some incredible strings. With the Authentic Acoustic SP strings, you get long-lasting, super comfortable, incredibly playable strings that take your tone to new sonic heights.Martin Authentic Acoustic Superior Performance SP strings feature higher tensile strength and tin-plated core wire on all six strings that enable a fuller and more balanced tone, quicker response, and increased tuning stability. Martin's impeccable standards for acoustic guitar tone are embedded in their string design and precision manufacturing process. They didn't think the strings available from other brands brought out the most in their guitars, so they decided to make their own! For a limited time, Martin Authentic Acoustic SP strings are available in three-packs for a fantastic price. $14.99 for 3 sets!