tuning fork includes 4096 Hz, 4160 Hz, 4225 Hztuning fork set brings a clear tone with longer sound and more accurate tuning. Extended smooth aluminum handle for easy bone conduction testing and longer-lasting ringing frequency.tuning fork set is made of high-quality aluminum alloy material, with a clear tone, longer sound, and perfect frequency. Non-magnetic, , and durable.Colored tuning forks, Perfect for releasing stress, achieving deep relaxation, calming the mind, promote positive energy, which is demanded by wellness , , musicians teachers, science lovers, sound therapists, etc. 4096C is great for crystal-cleaning purposes.Colour:Photo ColorMaterial:aluminum alloyPackage Contents:3 x Tuning Fork1 x hammer(Random color style, don't accept the specified)1 x storage bag1 x cleaning clothOnly 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.