Tuning forks are a gentle acoustic sound therapy. The vibration of this fork is tuned to the solar plexus chakra situated 2" above the belly button. Creating a smooth energy flow and a balanced harmonious state. When your solar plexus chakra is open, flowing, and balanced you will have self respect and respect for others, be outgoing, cheerful, relaxed, spontaneous, enjoy physical activity, and show warmth. For best results tap the tuning fork over the solar plexus chakra and move in a circular motion or just hold in the hand because the vibration will know where to go. Yellow solar plexus chakra fork comes in its own pouch with a 7" mallet and stamped 126.22 Hz. The 8th under octave then has a frequency of 126.22 Hz. The corresponding color is green to yellow with a wavelength of 540 Nanometer.