[High Quality] The adjusting fork set is made of high-quality material. Compared with steel tuning forks on the market, it features refined workmanship, lightweight design, and durable corrosion-resistant aluminum alloy construction. [Accurate Frequency] The tuning fork set offers accurate frequency calibration with resonance lasting up to 25 seconds. [Multifunctional] The adjustment fork set is suitable for various applications. The 528 Hz fork is associated with positive energy, making it ideal for promoting focus, balancing energy centers, and supporting overall well-being. Also suitable for use with pets. [What You Will Receive] The tuning fork set includes: 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz, 639 Hz, 741 Hz, 852 Hz, 963 Hz. Color: Silver. Material: Aluminum alloy. Package contents: 2 x drumsticks (color style may vary, specific color cannot be specified), 9 x tuning forks, 2 x cleaning cloths. Only the listed items are included; other products are not part of this package. Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3 cm.