Our Singing bowls include a wood mallet. Hand hammered singing bowl sizes will vary, some are thicker, some are thinner. The size and weight given here is an average. SYMBOL: Singing Bowls are one of the ancient Tibetan meditation tools. The pure sounds produced when the rim is rubbed by the mallet is said to put the brain into a meditative state. The vibrations of the singing bowls have the same wave length found in the brain waves that produce feelings of relaxation.