Here’s what Fender say:
Crafted in Corona, California, the American Jazz Bass delivers the exceptional tone and feel you expect from an authentic Fender—along with new enhancements that make it even more inspiring to play. Featuring vintage-style paddle keys, tapered tuning machines are wider at the top than the bottom, forcing the string windings downward and keeping them tight for increased sustain and enhancing tuning stability. Medium-jumbo frets make it easier to achieve wide, expressive bends that add your personal touch to your music. Handcrafted in Corona, California, Yosemite pickups are specifically voiced for each instrument and position to create sonically versatile and musically useful sounds. This model features a four-saddle bridge for solid tuning stability, precise intonation and increased sustain. Featuring a “Modern C”-shaped profile that works well with almost any playing style, the neck also hosts a satin finish on the back, giving it a smooth, fast playing feel. This uniquely Fender tone system lets you cut treble without losing gain or “muddying” your sound, preserving your carefully shaped tone.