10" Diameter Violet/Crown Chakra Colored Crystal Singing Bowl With 9" Wooden Rubber Mallet and Rubber Ring Base Included. Tuned to 432 Hz. Each bowl is tuned to a specific note often used in sound therapy, meditation, and energy healing practices to promote relaxation, balance chakras, and facilitate spiritual growth and well-being. The 10-inch diameter Crown Chakra Crystal Singing Bowl is an exquisite instrument meticulously crafted to harmonize and awaken the energy associated with the Crown Chakra. This crystal singing bowl produces transcendent tones that create a transformative and resonant vibrational experience.