Features 1、Main Feature: A tuning fork is a sound producing instrument that is used to debug instruments and test intonation. There are letters and numbers on the tuning fork. The letters represent the tones, and the numbers represent the number of vibrations per second of the tuning fork. 2、440HZ Tuning Fork: This is a 440HZ tuning fork, check the specifications for better and more accurate using experience. 3、Wide Application: This tuning fork is suitable for violin, mandolin and guitar. Put the tuning fork on the table, place it on the top of the instrument, and adjust your A string to 440 Hz. 4、Steel Material: Made of premium steel material, this tuning key is strong and sturdy, not easy to deform or damage, which ensures a long life span. 5、Ideal Replacement: This tuning key possesses both delicate appearance and professional performance, is an ideal replacement for the old and damaged parts. Specifications: Item Type: Tuning Fork Frequency: A 440 Material: Steel Product Size: Approx. 12 x 1.8 x 0.9cm / 4.7 x 0.7 x 0.4in Surface Treatment: Chrome plating Purpose: Instrument timbre adjustment Package List 1 x Tuning Fork