Following the same principles of Crystal Bowl Sound Healing, Crystal Tuning Forks operate simultaneously on the physical body and the auric field around each of us, the incredible sound is truly experienced on our many levels of existence. You are looking at the only Aqua Aura Quartz Crystal Tuning fork in existence! It is also the only Sound Healing Instrument Metaphysically etched! Skydin Zeal’s incredible Solar Circuitry design is both Space Age and ancient as it draws upon the hidden Sacred Geometry of Ancient Scandinavia! This Sacred Geometry is closely connected to Kabbalistic/Egyptian Sacred Geometry, more information on this field can be found on http://www.Skydin.com/skydinslibrary.html Aqua Aura, by the way, is a fascinating, Iridescent, Opalescent Sky-blue surface quality that is achieved when pure, 24k Gold is vaporized and is attracted by the Quartz Crystals piezoelectric charge! The result is a truly space-age hybrid, originally natural crystal! In fact, this alchemic process is used in complex outer space applications! The Spiritual Community at large has unanimously recognized Aqua Aura as very beneficial in Crystal Healing, even those proponents of Natural-Only Crystals. Skydin Zeal himself, through many years of experiencing, has found this to be true, far before knowing the majority consensus. This Large Sized Quartz Crystal Tuning Fork is New and measures 17" Long. The specific Tone of this Tuning fork is an absolute Perfect Middle C.