SKU: Guitar Bridge-GM013-Chrome-Zinc-Alloy I am the second owner, and it has not been used since I purchased it as a new/unused item. All that is included are the metal parts shown in the images; the main body only, no box. Wide Travel Tune-O-Matic Bridge It is characterized by pre-grooved string slots. Chrome-plated archtop guitar bridge with adjustment knobs. - Type: Bridge - Material: Metal - Finish: Chrome plating - Accessories: 2 adjustment knobs - Design: Archtop - Mounting holes: 6 holes How do Guyker High-Quality Bridges improve the tone and playability of a guitar? Guyker Guitar Bridges are designed to improve the tone and playability of a guitar. These bridges are designed to improve the transfer of vibrations from the strings to the guitar body, resulting in enhanced resonance and a richer, more vibrant tone. In addition, they provide stable string tension and precise intonation adjustment, contributing to improved playability. Thank you for looking.