Brass Singing Bowl - LargeIn Buddhist practice, singing bowls are used as a support for meditation, trance induction and prayer. Singing bowls are a type of bell. Rather than hanging inverted or attached to a handle, the singing bowls sit with the bottom surface resting. The sides and rim of the singing bowls vibrate to produce sound. Bowl and Mallet Set. Size: D: 17cm, H: 7. 5cm Striking Tone (Yin): D3 146Hz Singing Tone (Yang): D4 293Hz