The green 10" model is aligned with the heart chakra and tuned to the note F with the international standard pitch of 440 Hz (concert pitch A). This is the standard in the Western music world, making it easy to combine with other instruments to take listeners on a special musical sound journey. The Crystal Singing Bowl Lotus comes with a wooden mallet specially designed for use with crystal singing bowls. In addition, an included silicone ring ensures a secure stand and optimal vibration behavior of the bowl - so it can unfold its full sound potential at any time.