Super frozen for better tone and longer life.
Martin Cryogenic strings are produced to the same high quality standards as other Martin Strings. An additional step in the manufacturing process exposes the strings to extremely low temperatures (-300 F), a process used in "high tech" industrial applications where consistent hardness of metal materials is required. Many musicians feel that this process extends string life and enhances the tone of the strings. Gauges 12-16-25-32-42-54.