VERITAS* Acoustic Guitar Strings maintain their tone, tuning stability and intonation thanks to ACT* (Accurate Core Technology), a process of coating the round core wire, which locks the wrap wire in place and extends string life by protecting the core from corrosion. A phosphor bronze wrap wire delivers a traditionally bright tone and natural feel. All VERITAS* sets include both standard plain steel AND Xenon Power-Plain* strings, which have increased output to balance with the wound strings.