Santa Cruz Strings are engineered to do what others cannot, to put the exact tension on each individual string to create the appropriate download pressure. These calculated tensions determine the optimal relative volume between strings, or EQ, for your instrument. Santa Cruz Strings require precise core to wrap ratios and precision fit and finish for unprecedented tolerances of one half of one thousandths of an inch. This accurately determines the tension/volume of each string to the exact EQ that your guitar was designed for. State of the art metallurgy and micro-coating assures long life by preventing corrosive moisture from contacting the core of these nickel and lead free strings.