Traditional Tibetan Singing Bowl - Jam #133 Tone D. Jam bowls are the most common hand-pounded Tibetan Singing Bowls. They are a heavier 7 metal Bowl with a round shape, long resonation and big vibration. Change the stick change the sound. Size does matter especially for the bigger bowls. Vibration of the bowls can be enhanced by using a felt medicine stick great for healing and music and sound therapy. Tibetan Singing Bowls have been used for centuries to calm and heal the body with melodic chimes. When played, they produce complex multiple frequencies and overtones very unique to each individual bowl. The sound and use of the bowl can be changed considerably by just switching the type of stick used. Singing bowls are commonly used for relaxation, focusing, meditation, healing, clearing, yoga sessions, sound and music therapy.