Singing bowls fill the air with harmonic vibrations, adding depth and dimension to any personal prayer or meditative activity. The singing bowl is used during Buddhist practices like meditation, prayer and trance induction. Friction created by a mallet rubbed around its rim produces astonishingly complex and continuous overtones of great harmony. A more mellow tone can be produced by striking the bowl with a mallet wrapped in soft material. Meditation bowls are made of various metal types and sizes for unique tonal qualities.