Upgrade your car's audio system with the NVX SDBPRO20 PRO Ultra Thick Stealth Black sound deadening material. At 4.5mm thick, this ultra-dense material offers over twice the noise and vibration control of standard dampening materials. With five 18" x 32" sheets providing 20 square feet of coverage, it reduces up to 70% of unwanted noise, stops rattling, and minimizes distortion for clear, intense audio performance. Ideal for SPL competitors, this material is made from durable 100% Butyl Rubber, offering excellent long-term performance. The peel-and-stick aluminum backing ensures easy installation and allows it to conform to complex vehicle contours, making it perfect for doors, roofs, floors, and trunks. Improve your sound system, reduce cabin noise, and create a sealed, soundproof environment with NVX SDBPRO20 PRO Ultra Thick Stealth Black.