[High Quality Aluminum Alloy Material]C128, C512, C256 tuning forks are made of high-quality aluminum alloy materials, with clear sound, corrosion resistance,non-magnetic and no rust.It is suitable , school or clinical use. [Lightweight & Easy to Use]The tuning fork set has an extra-long turned aluminum handle, which can be readily evaluated for bone conduction and is easy to use. It is made of durable lightweight materials and is comfortable to hold. It is equipped with a flannel bag for easy outings. [Perfect Effect]The tuning forks for has exceptional performance and frequency accuracy. The sound quality will not have much deviation. [ERGONOMIC AND EASY TO USE]The rounded 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: Metal colour: black + silver Package Contents: 3 x Tuning Fork (128 Hz, 256 Hz, 512 Hz) 1 x wrench 1 x bag Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.