Made of high quality aluminum alloy material.Tuning to the vibrational properties of our magnificent .Provides deep relaxation and improve mental clarity and brain function.Improve your physical strength and mental concentration.Reduce stress by pulling your body into a central space.Develop and improve your sound capabilities. Enhanced massage, acupressure, dreaming and meditation.Balance your nervous system.Integrate left and right brain thinking patterns.Ergonomic design, antirust, preservative.Designed for the perfect balance of instruments with high performance and superb craftsmanship. Material: Aluminum alloy colour: silver Package Contents: 1 x 128Hz Tuning Fork 1 x 256Hz Tuning Fork 1 x Percussion Hammer 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 +/- 1-3cm.