Smooth and balanced, Every String is mathematically optimized for a balanced, even performance across the fretboard. Hexagonal steel core make your playing full of dynamic balance of rich, full-bodied tone and sparkling high-end clarity Lasted Quality tone---easier to tune and definitely sounds better which can match the tone and playability of the other higher-end end strings Strings are precision manufactured to the highest standards and most exacting specs to assure consistency, optimum performance, and long life. String Gauges: Plain Steel .013, .017, Phosphor Bronze Wound .026, .035, .045, .056