For practitioners and users of sound healing. A wonderful and affordable alternative to gongs, the Ohm Crystal Bowl fills your room with the healing and therapeutic resonance of Ohm with all its beautiful overtones. Activating a Quartz Crystal Bowl beneath a treatment table adds yet another dimension to a Sound Healing treatment. Strike the bowl periodically during the treatment with the mallet. If your treatment table is made of wood, the cells of the wood will act as resonant chambers, harmonizing with the music, tuning forks, and overall enhancing the treatment. These bowls are tuned to OHM frequency of 136.10 Hz or an octave of 136.10 Hz and are accurate within 5 Hz. Includes “O” ring and suede rimming mallet. 12 inches in diameter.