The Meinl Sonic Energy Planetary Tuned Therapy Tuning Forks are manufactured in Germany according to Hans Cousto's calculation (The Cosmic Octave). Each tuning fork is tuned exactly to the frequency of the respective celestial body in order to achieve a therapeutic effect. The Therapy Tuning Forks are larger and heavier than the Standard Tuning Forks. This allows them to swing longer and to be struck less often during a treatment or in the professional therapy area. The Therapy Tuning Forks are made of high-quality nickel-plated steel and have a matte finish. Therapeutic effect: "The relaxation of the soul" Promotes self-confidence Leads to knowledge Leads to clarity, lightness, relaxation, brightness, and fullness of life