From Fender:
The sound of Fender’s flagship instruments. Fender Ultra Noiseless pickups are the pinnacle in stacked single coil design, crafted with new winding techniques for livelier and more expansive tone. Alnico 5 magnets with polysol wire deliver a vintage voice with the classic punch, guttural growl, singing high end and extra range you expect from a five-string Jazz Bass.
Ultra Noiseless Jazz Bass pickups are designed for passive and active circuitry, with a clear and open sound.