Featuring titanium core wire, nickel wrap wire, and cryogenically treated stainless steel plain strings. Titanium is naturally more flexible than steel, but just as strong, so the strings are easier to press down, reducing finger fatigue. Light gauge 012 016 027w 034w 044w 055w. NOTE: The diameter of these strings are slightly larger than standard light gauge strings, so a guitar's nut slot may need to be adjusted accordingly (especially for the wound strings).