Singing bowls first originated in China. They're largely regarded as a modern creation, as opposed to one that's steeped in history and tradition.
These unique pieces have been used for everything from music making, to sound therapy/healing, yoga and meditation. You can play them by moving a mallet along the outer rim. This results in a highly resonant, musical note. Many people swear by their various benefits. The vibrations can supposedly create positive energy, relieve stress and produce a sense of complete calm. Each bowls overall tone is determined by its diameter.