Sound Deadener Foam Insulation Heat Noise Proofing Car Mat Roller 4.5 square meters ThickerSound Deadener Foam Insulation Heat Noise Proofing Car Mat Roller 4. 5 square meters Thicker FEATURE: Strong insulation performance. Excellent sound absorption and good vibration resistance. No powder, no smell, safe to use, waterproof and dustproof, practical. Flexible, crush resistant, non toxic odor free (Will not smell), creates mold and mildews resistant vapor barrier. Make the heat of the engine evenly distributed to avoid overheating the lid.