.010 .0135 .017 .025w .034 .046 - Set / E-Guitar Nickel-plated steel wound Hex-shaped core Bright tone, excellent intonation Each set of D'Addario Balanced Tension XLs is comprised of mathematically optimized string gauge combinations. With the result of greater control and playing comfort. Through extensive, detailed, and comprehensive testing, the performance advantages you'll experience with D'Addario Balanced Tension XL sets over traditional strings are as follows: Based on traditional gauges, but optimized for "balanced tension" between strings. Mathematically equalized resistance delivers comparable feel from string to string. Even effort while bending, strumming, plucking and slapping delivers improved dynamic control.