The Meinl Crystal Singing Bowl Chakra Set Colorfrosted is colored frosted and made of high purity quartz . It consists of seven singing bowls in sizes 14", 13", 12", 11", 10", 9", 8", these come in tunings C4, D4, E4, F4, G4, A4, B4. The clear sound and appealing design create a harmonious aura. Their long-lasting, spherical tone spreads out when the singing bowl is gently struck or rubbed, so the energy is felt throughout the environment. Seven matching silicone rings, on which the Meinl singing bowls stand securely, are included to prevent damage and ensure the best sound resonance. In addition, two silicone rods and a mallet are included for conveniently striking all sizes. The professional singing bowl set is ideally suited for chakra healing, meditation, sound therapy, yoga, emotional state adjustment and of course room decoration.