As our premium uncoated string, NYXLs offer higher break strength, enhanced tuning stability, and accentuated mid-range response versus our standard strings. Made with a NY Steel core, premium nickel-plated steel wrap wire, and Fusion Twist technology, NYXL pedal steel guitar strings are tough enough and versatile enough to handle anything. This 12-38 Custom Medium E9 set is designed for E9-tuned pedal steel guitar, using the gauge made popular by Paul Franklin.