The white matte Meinl Sonic Energy crystal singing bowl made of high-purity quartz creates a very harmonious aura with its sound and design. Its long-lasting, spherical tone spreads when gently struck or rubbed, making the energy palpable throughout the surrounding area. All crystal singing bowls come with a silicone ring to prevent damage and ensure the best sound resonance. This singing bowl is 10 inches in size and resonates at the tone F with 432 Hz. The corresponding solar plexus chakra is said to promote peace, inner harmony, and serenity.