Used for a variety of purposes like chakra healing, meditation and sound therapy, Meinl's Sonic Energy Planetary Tuned Crystal Singing Bowl for Synodic Moon is made with calculations of Hans Cousto (The Cosmic Octave) to match planet frequencies. This white-frosted bowl is crafted from quality quartz that produces a resonant tone and pleasing sound. Tapping and rubbing allows the spherical tone to spread in your surroundings that produces energy. A silicone ring is included in order to avoid heavy impact and ensure the best tone is achieved.