Have you ever heard of a guitar fret? Frets are metal strips embedded into the fingerboard on the neck of a guitar. There are many types of frets with different heights, widths and shapes. The tone of a sound is made by pressing strings down onto the frets. YKK® wires made using high-quality materials were finally implemented as guitar frets after being adjusted to various hardnesses based on the requirements of guitar manufacturers. Our frets have been adopted by world famous guitar manufacturers and many musicians have come to love and actively use them.