[High Precision]: Compared with steel tuning forks on the market, using high-quality aluminum alloy material, the performance is superior and the frequency accuracy is consistent.[Wide Compatibility]128Hz, 256Hz and 512Hz Adjusting Fork Set for treatment. Ideal for patient hearing therapy, treatment, childrens education, stress pain relief, purification of mind and body, and great for meditation or yoga.[ERGONOMIC DESIGN AND EASY TO USE]The rounded design of the tail perfectly combines aesthetics and comfort, and comes with a silicone hammer for added control over striking force, allowing you to better use your tuning fork.Material: Metalcolour: silver + blackPackage Contents:3 x Tuning Fork (128 Hz, 256 Hz, 512 Hz)1 x Rubber mallet1 x Cleaning cloth1 x Epair tool1 x Velvet storage bagOnly the above package content, other products are not included.Note: Light shooting 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.