- Solfeggio "Fa" frequency 639 Hz - Famuli tuorum - ability to relate - Diameter: 10" / 25 cm - Design: "TriColor Frosted" - Colour: Indigo / White / Indigo - The colour combination results from the octave correspondence of this frequency in the light spectrum: indigo - Including mallet, pouch and ring EUR 139.00 - See more - Buy online