This metal tuning fork, made by BioSonics, is perfect for relaxation and sound therapy. - Brand: BioSonics - Type: Tuning Fork - Material: Metal DNA 528Hz Tuner Length: Approximately 17cm This is a tuning fork made by BioSonics. There are some stains and blackening due to aging. Please check the images. If you have any questions, please feel free to ask in the comments. We are looking forward to your purchase if you understand that this is a used item.