aluminum alloy with clear tone, longer sound and perfect frequency A hz Tuning fork for medical, hz is the frequency of love that is for ideal for DNA repair, relieving stress pain, improving attention hz tuning fork set can be easily placed in any instrument for case or pocket due to its small size Non-magnetic, corrosion-resistant aluminum alloy construction for lightweight and durability High accuracy, this ergonomic handle is easy to hold, Manufacturer: Beimus