Bol chantant tibétain, OM

Historically singing bowls were manufactured in Asia, especially in Nepal in China and Japan.
The singing bowls are associated with decorative bells that littered the Silk Road. The types most rependu bowl are those of the Himalayas and are often referred to as Tibetan singing bowls.
The singing bowls are used to start periods of silent meditation. They are also used during the singing and can mark the passage of time or a change of activity during meditation as in Japan. Some Tibetan monks use singing bowls during their ceremonies.
The singing bowls are used by striking the edge of the bowl with a mallet, or may be used by rubbing a wooden mallet, leather, felt or plastic around the edge of the bowl, to unveil the harmonies of her singing. Each singing bowls and produces a single vibration.