Check the listing for details. 9 Pcs Silver Tuning Fork Set for Instrument Treatment Aluminium Fork. Condition: New. Listed at 64.69 USD. Tuning Fork SetProduct Details1.The grade tuning fork set suitable for musical instrument,yoga,sound testing,vibration treatment.A pleasant tone is produced when tapping, which can effectively improve physical and reduce stress; The tuning fork's unique metal frequency can also enhance a person's voice recognition ability and improve hearing. 2.The sound testing tuning fork set is made of aluminium alloy material,after strict testing, to ensure the accuracy of the tuning fork frequency.Sound quality is clear, sound pleasant, corrosion resistant aluminum alloy structure, light weight, easy to carry, durable.3.Tuning Fork Set included 174 Hz,285 Hz,396 Hz,417 Hz,528 Hz,639 Hz,741 Hz,852 Hz,963 Hz;Color:Silver;Material:Aluminium Alloy;Pack with 9pcs x tuning fork;1pcs x flannel bag;1pcs x rubber mallet(no base);4.