Tibetan singing bowls have long been used by Buddhist monks to practice  meditation.  The vibrations of these singing bowls are said to have a positive effect on the body by reducing stress.  It does so by harmonising the cells and balancing the body's energy system.  Singing bowls can stimulate the immune system and produce beneficial changes in brain waves helping to:
 
reduce anxiety
lower anger
lower blood pressure & increase blood flow
improve circulation 
promote stillness, happiness & chakra healing
 
The singing bowl comes with instructions on how to use and is approx 10.5cm in diameter.