Adjusting Fork Set is made of high quality material. Compared with steel tuning forks on the market, it is more refined in workmanship, lighter in weight, and durable in corrosion-resistant aluminum alloy construction. Tuning Fork Set has more accurate frequency and frequency up to 25 seconds. Adjustment Fork Set is suitable for treatment. 528 Hz is the frequency of love, great for repair, balancing energy centers, enhancing focus, purifying the mind and body, and also great for wellness treatments and playing with pets. Tuning Fork Set Includes: 136.1HZ-272.2HZ Colour:Photo Color Material:Aluminum alloy Package Contents: 1 x mallet(The color style is random, and the specified color cannot be ) 8 x tuning forks 1 x cotton 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 +/- 1-3cm.