About OM singing bowl
In Hinduism, Om is one of the most important spiritual sounds. It refers to Atman (soul, self within) and Brahman (ultimate reality, entirety of the universe, truth, divine, supreme spirit, cosmic principles, knowledge).

Om symbolization on Meditation:

Om is a very simple sound with a complex meaning. It is the whole universe coalesced into a single word, representing the union of mind, body, and spirit that is at the heart of yoga. Often chanted three times at the start and at the finish of a yoga session, the sound of om is actually three syllables: a, u, and m.
what happens when we chant om ?

Meditation with Om chanting relaxes our mind and body, our blood pressure decreases and the heart beats with a regular rhyme which is good for our heart health. ... When the OM Mantra is chanted in a group, the effects are amplified, and this will produce immense positive vibrations which charge up the entire vicinity.

Measurement:
Diameter : 11 "/28 cm
Height : 6"/ 15 cm
Weight (approx) 2 kg ± 15 gram