Tuning forks are a gentle acoustic sound therapy. The vibration of this fork is tuned to the heart chakra situated in the center of your chest. Creating a smooth energy flow and a balanced harmonious state. When your heart chakra is open and flowing smoothly we generate compassion, nuturing, growth towards uncontional love, and allows us to be in touch with our feelings. For best results tap the tuning fork over the heart chakra and move in a circular motion or just hold in the hand because the vibration will know where to go. Green heart chakra fork comes in its own pouch with a 7" mallet and stamped 136.10 Hz. The base of this tone is the rotation of the earth around the sun.