Description: Material: The sound deadening roller is made up of silicone Roller, Handle, and Metal Connector. Function: This Auto Noise Sound Deadener makes the sound insulation pad installed on the surface of the car more effectively, and it also can make tire and tube patches adhere fully during repairs. It is perfect for installing sound deadening for the entire vehicle. Design: This roller has slight grooves on the wheel to prevent sliding or slipping. The spinning wheel rolls extremely smoothly and you don’t really need to put too much pressure into rolling. Portable: Lightweight and compact, portable and easy to carry. Easy to Use: The car application rolling wheel can be used for car trucks and vehicles to install mats without scratches and bubble. Specification: Material: Silicone Size Chart: 17.5cmx5cm/6.89inchx1.97inch 17.5cmx3cm/6.89inchx1.18inch 17.5cmx3cm/6.89inchx1.18inch 17.5cmx4.8cm/6.89inchx1.89inch Package Includes: 1 Car Audio Sound Insulation Wheel Note: Please allow slightly errors due to manual measurement and different monitors.