This is a roller for deadening car audio. Material: Plastic Length: Approximately 170mm Roller head width: Approximately 50mm The roller has bumps, so it can be pressed on points, ensuring no areas are missed. Air can be removed reliably. Professional car audio shops and other detail-oriented stores use point pressure application. It offers superior adhesion compared to flat rollers, enhancing vibration damping. It comes with a large roller and a small roller, allowing it to handle everything from flat surfaces to detailed areas. This is a rare product not sold at stores like Autobacs. *Depending on the production batch, the main handle may have a logo, please understand. It will be shipped in simple packaging. Type of car audio... Deadening kit