Each one is tuned to produce the corresponding frequency of the celestial body. These tuning forks have been designed for use in therapeutic applications.

Geomagnetic Field: The geomagnetic field has a strong north-south pole and a micro-pulsation spectrum. The minor third above the Schumann resonance (250,56 Hz) falls with its oscillation into exactly that range of this tuning fork to which the color blue-violet corresponds.