The tuning fork is made of high-quality aluminum alloy material, which is , anti-corrosion, durable, non-rusting and non-magnetic. Wooden hammer, well made and smooth. Tuning forks are great for relieving stress, improving meditation, achieving deep relaxation, calming the mind, and promoting positive energy, and are in demand by health , therapists, musicians, science enthusiasts, sound therapists, and more. Makes the perfect holiday gift for friends and family. Colour:Silver Material:Aluminum alloy Package Contents: 6 * tuning forks 396 Hz, 417 Hz, 528 Hz, 639 HZ, 741 HZ, 852 HZ 1 * silicone hammer 1 * cleaning cloth 1 * aluminum storage case 1 * Tuning fork seat 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.