Martin MTCN160 Luxe Titanium Core Premium Acoustic Guitar Strings 12-55Martin Titanium Core strings deliver the ultimate players experience with patented technology only available from Martin. Experience a new level of comfort and response with industry leading stability and superior corrosion resistance. Titanium is more flexible than steel, providing a very comfortable playing experience while remaining strong and durable. Martin uses pure Nickel to wrap the Titanium strings. Pure nickel is naturally corrosion