This is a tone shift bridge from FREEDOM CUSTOM Guitar Research. It came with a used 5-string bass I purchased. I am selling it because I replaced it with different parts and no longer need it. 5-string versions are not currently sold to the general public. It is said to be the same as the one attached to the Antra series. I have included a photo of the string-through holes in the 8th image. It shows signs of use, but it works without any problems. I will include unused screws. The width is approximately 103mm and the depth is approximately 50.5mm. The weight was 231g on a kitchen scale. I will wrap it in bubble wrap and ship it via Nekopos. No price reduction, please. FREEDOM CUSTOM GUITAR RESEARCH