NYXL0946 is a hybrid set, combining the high strings from a super light set (.009) with the low strings from an regular light set (.046). The result is a set with strong fundamental low end, but with super flexibility on the high strings. 

NYXL's feature D’Addario’s exclusive New York manufactured, high carbon steel alloy for unprecedented strength – play fearlessly
Improved tuning stability compared to traditional nickel wound strings - get in tune faster, stay in tune better
Wound strings with enhanced mid-range frequency response in the 1 - 3.5 kHz range – more presence and crunch to cut through the mix
NYXL0946 offers strong fundamental low end, but with super flexibility on the high strings: Plain Steel .009, .011, .016, Nickel Wound .026, .036, .046
Environmentally friendly, corrosion resistant packaging for strings that are always fresh