1. High-quality physical experiment equipment, durable and practical. 2. Two tuning forks of equal efficiency are made of metal. 3. The edges and corners are neat, the surface is chrome-plated, and the frequency is 440 cycles/second. 4. Tuning fork sets are used in schools to demonstrate the resonance of sound. 5. It can be used as a universal tuning fork for experiments, such as sound generation, interference, and sound conduction of substances. Material: Metal+wood colour: Wood color+silver Package Contents: 2 x Tuning Fork 2 x Wood Resonator Box 1 x Small hammer 1 x Knocker 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.