SoundQubed Q-Mat Sound Deadening Mat 40 sqft, Audio Insulation 40 Square Feet, 100% Butyl Rubber, Aluminum Backing 86.6Mils thick (2.2mm) Experience less stressful and/or fatiguing drives. Decrease rattles and vibrations. Decrease road, engine, and exhaust noises. Increase SPL! Increase the dynamic range of your stereo system.