2 x (pair) Sprague New Old Stock .1 uF / 400V Black Beauty Capacitor 1960's Fender Jazz Bass upgrade

For sale: matched pair (2 pcs) SPRAGUE "BLACK BEAUTY" - one of the most sought-after capacitors by guitarists.
Value: .1uF / 400V. The exact measurement is: 0.106uF / 400V & 0.107uF / 400V

Used in the most iconic guitars:

Gibson Les Paul Standard 1958–1960 (Burst)

Gibson ES-335

Gibson SG Standard (early 1960s)

Apparently, the oldest Teles sometimes featured these capacitors in the 0.1uF size to achieve a rounder, jazzier sound. Reggae musicians now often use the 0.1uF value in guitars and basses, including Teles.

Gibson's jazz models used these capacitors; here are the most commonly used capacitors:

0.047 µF – 0.1 µF

Purpose: a darker, more musical, rounder bass tone at 0.1uF.

However, today this capacitor (0.1uF) is most often used to upgrade bass guitars, including the iconic Fender Jazz Bass.

Here's a sound comparison of different capacitor sizes (using a standard ceramic capacitor):

The capacitors are New Old Stock, never used. They have also been measured and tested for leakage current. They are in excellent condition.