DESIGNED FOR INSTALLED SOUND DEADENER FOR CARS - This sound deadening roller features ridges on the head to insure the sound deadening mat is properly installed on your car's metal surface for the best adhesion. Without this roller, your sound deadening mat will not have the best adhesion which will reduce the effectiveness of your sound deadener. EASY TO USE - This sound deadening roller features easy to grip handles along with built in steel bearing for easy and quiet rolling application. MUST HAVE FOR BEST ADHESION - Minimizes air bubbles and gets the best adhesion for your sound deadening mats. Our rollers have ridges to ensure the butyl on the sound deadener adheres to the metal surface of your car evenly. SAVE TIME - Finished your project faster and save time with our sound deadening roller. Everybody knows with the right tools, the job becomes much easier. SAVE MONEY - Don't need to pay professional to install it for you when you can save that money and install it yourself at the comfort of your own home.