21cm í þvermál, high-purity quartz The color-frosted Meinl Sonic Energy Crystal Singing Bowls made of high-purity quartz create a charming aura with their sound and design. Their long-lasting, spherical tone spreads when the singing bowl is gently tapped or rubbed so that the energy can be felt in the entire surroundings. All Crystal Singing Bowls are delivered with a silicone ring to avoid possible impact and to ensure the best resonance. The fundamental A4/a' is tuned to 440 Hz. You can use Crystal Singing Bowls for various purposes: Chakra healing, meditation, sound therapy, yoga, improving your home Fengshui, adjusting your emotional state, or even room decorating.