Martin Titanium Core strings deliver the ultimate players experience with patented technology from Martin. Titanium Core strings provide the most superior intonation and tuning stability of any string on the market. Titanium is naturally more flexible than steel, but just as strong, so the strings are easier to press, reducing finger fatigue. The combination of titanium and pure nickel used in the Titanium Core strings provides natural corrosion resistance, meaning they will last a really, really long time under normal circumstances. MFSKU MTCN160 UPC 729789530583