This is a bridge for a Precision Bass. I bought it new, but I'm selling it because I'm not using it. It's unused, taken out of the box only for the photos. It has been aged from the beginning. ◆What is Zymo Aged? Zymo Aged is a world-first organic sound aging part that creates the "resonance and tone of aging" found in old guitars by generating special bacteria that ferment metal using a unique biotechnology-based method to promote the aging process, and applying an invisible, random, and natural fermentation process (aging) to metal parts such as bridges and springs. "Zymo Aged" creates a vintage tone through real aging, not just the appearance of wear and tear like relic or aged finishes. We will be releasing Zymo Aged parts compatible with various models in the future.