The MEINL Sonic Energy Solfeggio crystal singing bowl set brings ancient sound frequencies into your modern practice. This 6-piece set features high-purity quartz crystal bowls precisely tuned to the powerful Solfeggio frequencies of 396Hz, 417Hz, 528Hz, 639Hz, 741Hz and 852Hz. You'll experience the profound healing vibrations said to promote joy, overcome trauma, influence DNA, harmonize relationships, enhance intuition and open consciousness as you gently tap or rub the bowl's surfaces. Extremely long-lasting resonance fills your space with soothing, spherical tones. Use these singing bowls for chakra healing, meditation, sound therapy, yoga, improving feng shui or simply adjusting your emotional state. Protect your investment with the included silicone rings and keep the bowls ringing true with the silicone rod and mallet.