Made of high-grade stainless steel materials and the use of wooden outer packaging, with a mallet. It can be used in physics classes to verify the occurrence of sounds and to explain the relationship between tones and audio. It can also be used as a health care massage tool. 8 tuning forks of different frequencies can be used as the tuning standard for musical instruments. It can be applied in music room, health club and so on. Name:Tuning Forks Frequency:256Hz, 288Hz, 320Hz, 341Hz, 384Hz, 426Hz, 480 Hz, 512Hz Colour:Silver Material:stainless steel Size: Box Size:22x16x3.5cm or 8.7x6.3x1.4inch Tuning fork size: 256Hz:14x2.5x1cm or 5.5x0.98x0.39inch 288Hz:13.5x2.5x1cm or 5.3x0.98x0.39inch 320Hz:13x2.5x1cm or 5.1x0.98x0.39inch 341Hz:12.5x2.5x1cm or 5.0x0.98x0.39inch 384Hz:12x2.5x1cm or 4.7x0.98x0.39inch 426Hz:11.5x2.5x1cm or 4.5x0.98x0.39inch 480Hz:11x2.5x1cm or 4.3x0.98x0.39inch 512Hz:10.8x2.5x1cm or 4.2x0.98x0.39inch Mallet length:19cm or 7.5Inch Package Contents: 8 x Tuning Forks 1 x Mallet 1 x Wooden Box 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.