Earthing Kit Unopened item. I am selling it because I didn't use it. The following is from the manufacturer: [Car Earthing Wire Kit] Connects ground wires in the engine room to reduce resistance and improve the flow of negative electricity. It is expected to improve the performance of the engine, audio equipment, etc., as well as fuel efficiency, starting performance, and responsiveness. [Dress-up Effect] The brightly colored earthing wires will brightly dress up the engine room. It can add an accent to the engine room. [Easy Connection] It comes with 3 types, a total of 5 terminals connected to the ground wires, terminals (terminal mounting hardware), and screws, so you can easily connect them by deciding on the installation location. *Please measure the length of the installation location in advance and check the approximate length. [About Earthing] In older cars, due to aging, the ground points and the round terminals and crimp terminals on the tightening side may rust or become dirty, causing poor contact. Furthermore, the deterioration of the original ground wires increases resistance and impairs the function of the ground. Even if you polish the ground points with a wire brush or sandpaper, the screw part will not be clean. Furthermore, the wiring (copper wire) in the engine room oxidizes and deteriorates over time, and it hardens and increases resistance when exposed to wind, rain, and heat. That's why earthing improves the flow of electricity. [Specifications] Set contents: 100cm x 2, 80cm x 2, 60cm x 1 (wire), mounting screws, terminals (connection金具・adjuster) Wire diameter: Approximately 9mm Since this is a new, unopened item, we cannot handle any product defects. If you have any issues, I will provide you with the contact information for the store (Yahoo! Shopping), so please contact them.