Usage Tips:[Package Includes] 1 x 0.24inch (6mm) roller,1 x 0.79inch (20mm) roller and 1 x 1.57inch (40mm) roller. 3 sizes of rollers meet different needs. With the large one you can roll longer flat sections saving, and get in tight corners such as curves, center console and pillar spots with the smaller ones. [Raised Corrugated Design] sound deadening roller adopts raised corrugated design to adhesion. It has a corrugated profile that contributes to better handling and prevents the barrel from slipping. The roller easily moves across the and presses the sound deadening material to the of your car. [Thicken & Solid Metal Roller] Constructed with high quality metal wheel, riveted steel roller supports and built in steel bearings for easy and quiet rolling application. Thicken and solid design makes it easier to make all contact surfaces fully and tightly fit when using, as well as the tire and tube patch to adhere completely during maintenance. Comparing to plastic, wooden and polyurethane rollers, the metal spinning wheel works much more effectively. [Fastening Connection & Ergonomically Handle] This car wheel roller has the advantages of compact structure and fastening connection. The short ergonomically handle makes it effortless in terms of operating and allows to reach even the most remote areas of the car. A tool to install soundproofing materials and sound deadener for cars. [Multipurpose Use] This sound deadener roller is for all types of soundproof mats, audio sound insulation and damping. Also perfect for installing car insulation materials for the entire vehicle, as well as being used as a perfect carpet roller, seam roller, wallpaper roller, tape roller and adhesive roller. Please note:There is a slight color difference or difference in kind, it does not affect the use, please do not mind, thank you! Colour:Black Material:Plastic+Metal Size:6/20/40mm Package Contents: 3 * Sound Deadening Roller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.