This is our Tibetan Singing Bowl. Traditionally, singing bowls are used in meditation practices. They work either by being struck with the mallet to make a tone (similar to a tuning fork or bell) or by running the smooth edge of a mallet around the outside rim to create friction and long "singing" tones. The tones created from friction carry vibrations that are typically very calming thereby aiding in the creation of an environment that is both peaceful and relaxing. Our children are very in tune with their environment and sensitive to surrounding sounds, lights, and movements. The singing bowl can't eliminate all stimulus or distraction but it does aid the children in focusing in on the one sound and calms the room.
I have included a video of interest with this post. It focuses on a teenager with Autism who uses singing bowl therapy.