low frequencyAdjusting 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.With Base Screws. Tuning Fork Set has more accurate frequency and frequency up to 25 seconds. Adjustment Fork Set is suitable for treatment. great for repair, balancing energy centers, enhancing focus, purifying the mind and body, and also great for wellness treatments and playing with pets. Specification: OTTO128HZ Material: Aluminum alloy colour: Silver Package Contents: 1 x mallet(The color style is random, and the specified color cannot be ) 1 x tuning forks With Base and Screws 1 x cloth bag 1 x Wrench 1 x cleaning cloth 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.