Complete Tuning Fork Kit: You'll receive a charming flannel goodie bag with four tuning forks and the important frequencies (128Hz,136.1Hz,528Hz, and 4096Hz), with two hammers and two repair 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, compact, ergonomic design, great for everyday home . Whether it's music or health , our tuning fork is an multi-tool you can to get the out of. Each produces a frequency for a different purpose. 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 reach deep into your body and help you physically, emotionally and spiritually [ERGONOMIC DESIGN AND EASY TO ]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 your tuning fork. Material: Metal colour: silver Package Contents: 4 x Tuning Fork (OM136.1, 128C, 512C, 4096C) 1 x 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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.