Jack's Guitarcheology is an official D'Addario dealer.

From D'Addario:

As our premium uncoated bass string, NYXL bass strings provide higher break strength, enhanced tuning stability, and accentuated harmonics versus our standard bass strings. Using a NY Steel core and premium nickel-plated steel wrap wire, with a reengineered core-to-wrap ratio, NYXL bass guitar strings deliver extra versatility, familiar feel, and a boosted tone that’ll expand the scope of your low-end. This 50-105 Medium gauge set has a higher tension, affording increased low-end response and output.

• NYXL bass guitar strings are our premium uncoated bass string, delivering superior strength and tuning stability, plus enhanced tonal response, versus our standard bass strings.
• The premium nickel-plated steel wrap wire used for NYXLs provides accentuated mid-range frequency response, so you get more presence and crunch to cut through the mix.
• Thanks to the NY Steel core wire, NYXL bass guitar strings stay in tune better and offer greater break strength than our standard bass strings.
• NYXL bass sets have a code on the recyclable, resealable VCI bag, which you can register to earn Players Circle points.
• NYXL bass guitar strings are made in the USA—drawn to our exacting specifications at our New York production facility.