Tone capacitors like this Emerson Custom Paper in Oil Tone Capacitor can be found inside the tone circuits of the most sought-after classic guitars ever made. This cap offers mil-spec construction, incorporating a hermetically sealed metal tubular casing with sealed glass ends. Its capacitor is comparable to vintage Sprague Vitamin Q Capacitors. Guitarists at Sweetwater know that every component in your guitar affects your sound - add more character to the tone circuit on your guitar or bass with the Emerson Custom Paper in Oil Tone Capacitor. Emerson Custom capacitors are constructed from the finest materials and come in a guitar- and bass-friendly size of 0.875" long by 0.40" in diameter. They are the only new mil spec capacitors being made in the US, and each one is accurate within a 10% tolerance. The hermetically sealed metal tubular case with sealed glass ends uses true vintage kraft paper in oil