This is a muffler earth product, known for improving fuel efficiency and increasing torque. With gasoline prices remaining high, it's recommended for those who want to improve fuel economy, whether for driving, leisure activities, visiting family, or daily commutes and shopping! Sold as a set of two. Total length: Approximately 25 cm (Please allow for a few millimeters of error) Terminal size: 8mm (Can be used with M8 bolts) Muffler earth is popular as an easy tuning option because it's easy to install and can be expected to improve fuel efficiency and torque. You can also install it on the muffler side using metal bands for hoses, etc., so it can be installed on various vehicle models. (Bands are not included, so you will need to prepare bands separately if you use them for installation) ⚠ Although it can be installed on various vehicle models, please research the compatibility, the required cable length, and the actual installation yourself. Instruction manual is not included. ⚠ To maximize the effect of the muffler earth, please remove rust, dirt, and paint from the installation area and install it so that the metal part and the terminal are in contact.