Complete Tuning Fork Kit: You'll receive a charming flannel goodie bag with four tuning forks and the most important frequencies (128Hz,136.1Hz,528Hz, and 4096Hz), with two hammers and two repair tools inside the pull string bag. aluminum alloy: The tuning fork is made of aluminum alloy, precisely tuned to within 0.5% of the indicated frequency, with clear sound, no magnetism, no rust, durable, , ergonomic design, great for use. Whether it's music or health use, tuning fork is an multi-tool that you can use to the most out of. Each produces a specific frequency for a different specific . Widely used: Tuning forks and hammers are thoughtful gifts, for women, for men, for Buddhist yoga teachers, for spiritual souls or meditation lovers. Clear, lasting tones that reach deep into your body and help you physically, emotionally and spiritually [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: Metal colour: silver Package Contents: 4 x Tuning Fork (OM136.1, 128C, 512C, 4096C) 1 x storage bag 2 x wrench 2 x drum sticks 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.