Weight: 9.00 oz 136.1hz is tuned to the Earth's frequency, the Earth/OM sound helps release strain and stress. It aids with grounding and bringing a sense of calm. Great during Meditation. Small Amethyst crystal included. 8.5" long. Strike the tuning fork and bring it near your ear. When the sound and vibration has stopped, repeat the process for your other ear. The fork can be used over any part of your body tho enhance cleansing and healing. You can also use it at bedtime. Activate the fork and wave it around your head and heart to induce sleep. It can be also used to charge your drinking water, food etc.