DIMENSION: Big wheel roller: 5cm/1.96inch x 18cm/7.08in; Small wheel roller: 3cm/1.18inch x 18cm/7.08in. This pressure rollers, with two different widths, can adapt to surfaces of different areas and improve smoothing efficiency. NONE-SLIP ROLLER: The roller is designed with gear shape, which can Increase friction and reduce slippage.This wheel roller can effectively increase the adhesion of sound insulation materials. DURABLE STRUCTURE: The wooden handle and plastic pressure wheel are connected by metal. The seam roller is well-made and suitable for sound Insulation the whole vehicle. COMFORTABLE HANLDE: The lightweight wooden handle ensure the perfect installation with better efficiency and less effort. MULTI-FUNCTION: Suitable for installing various types of sound insulation materials: car sound deadener material, soundproof wall panels, heat insulation foam/foil roof mat.