The 128 Hz tuning fork (C3 on the piano) is used for a variety of issues. Paramedics and healthcare professionals have used this fork to locate broken bones. This particular fork increases nitric oxide levels the most. This is a gas naturally produced in the body. Nitric oxide has many functions in the body. It can act as a messenger between cells, a neurotransmitter, and a hormone. It helps to dilate blood vessels, supports a healthy heart, increases brain capacity, improves sexual health, and increases blood flow. The 128 Hz tuning fork is particularly effective when placed on the rib heads, thoracic vertebrae, sternum, and hip bones. Two tuning forks gently tapped against the knees and brought to the ears create a beautiful, long-lasting low tone that is excellent for grounding and relaxation. To use, hold the 128 Hz tuning fork by the handle and gently tap the weights against your knees or on a tapping pad. Bring the tuning fork/forks to your ears and adjust the distance with the tone. Hold one fork about an inch from your left ear and an inch from your right ear. This will create a long-lasting tone. Material: Aluminum alloy Color: Silver Package Contents: 1 x 128HZ Tuning Fork 1 x Silicone Hammer 1 x Cleaning Cloth 1 x Repair Tool 1 x Storage Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.