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 ForksFrequency:256Hz, 288Hz, 320Hz, 341Hz, 384Hz, 426Hz, 480 Hz, 512HzColour:SilverMaterial:stainless steelSize:Box Size:22x16x3.5cm/8.7x6.3x1.4inchTuning fork size:256Hz:14x2.5x1cm/5.5x0.98x0.39inch288Hz:13.5x2.5x1cm/5.3x0.98x0.39inch320Hz:13x2.5x1cm/5.1x0.98x0.39inch341Hz:12.5x2.5x1cm/5.0x0.98x0.39inch384Hz:12x2.5x1cm/4.7x0.98x0.39inch426Hz:11.5x2.5x1cm/4.5x0.98x0.39inch480Hz:11x2.5x1cm/4.3x0.98x0.39inch512Hz:10.8x2.5x1cm/4.2x0.98x0.39inchMallet length:19cm/7.5InchPackage Contents:8 x Tuning Forks1 x Mallet1 x Wooden BoxOnly 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.