XS coated strings have the longest lifespan of all the strings D'Addario makes. The innovative XS coating makes these strings achieve maximum life and feel silky, fast without losing their tone. They are built with a NY steel core, with a nickel-plated steel winding and Fusion Twist technology that provides greater strength and stability for tuning, in addition to richer harmonics, better definition and clarity.
Calibers: .009, .011, .016, .026, .036, .046.