The 128 Hz Tuning Fork (C3 on the piano) is used for a variety of applications. Emergency medical technicians and paramedics have used this tuning fork to assist in locating bone fractures. This particular fork is known to stimulate nitric oxide production, a gas naturally produced in the body. Nitric oxide plays a role in various bodily functions, including cellular communication, neurotransmission, and hormone regulation. It supports healthy blood vessel dilation, cardiovascular function, cognitive performance, sexual health, and blood flow. The 128 Hz tuning fork is especially effective when applied to the rib heads, thoracic vertebrae, sternum, and ilium. When two tuning forks are gently activated and placed near the ears, they produce a sustained low tone that may promote grounding and relaxation. For listening, hold the tuning fork by the stem and gently tap the weights on your knee or a soft surface. Bring the tuning fork(s) toward your ears and adjust the distance based on the tone. Position one fork approximately one inch from the left ear and one inch from the right ear to experience a continuous pitch. Material: Aluminum alloy. Color: Silver. Package includes: 1 x 128 Hz tuning fork, 1 x silicone hammer, 1 x cleaning cloth, 1 x repair tool, 1 x storage bag. The package includes only the items listed; other products are not included. Note: Lighting reflections and display differences may cause slight variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.