The product not easy to rust and deform, and durable. With a frequency of 512 cycles per second, easy to use and operate, and can be used students or teachers. Tuning fork set is used to measure sound and verify sound wave conduction, the perfect experimental prop for school laboratory. It can be used as a general tuning fork for experiments, such as sound generation, interference, and sound conduction of substances. Colour:wood color + silver Material:wood+aluminum alloy Package Contents: 1 x Tuning Fork 1 x Resonant Box 1 x Hammer 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.