Product Details: NVX SDBBP45 Ultra Thick Sound Dampening Material. 4. 5mm, offering more than twice the thickness of standard dampening material for superior noise and vibration control. Five 18" x 32" sheets of premium sound-dampening material (20 square feet total). Effectiveness: Up to 70% improvement in noise reduction, creating a quieter cabin environment. Around 60-70% better vibration control, eliminating unwanted rattling and sound distortion. Up to 50% enhanced thermal insulation, helping regulate cabin temperature. Ideal for SPL Competitors: Maximizes SPL output by reducing panel flex, directing sound pressure for higher decibel levels, and minimizing distortion for clear, intense audio performance. Features: Made from 100% Butyl Rubber for durability and long-lasting performance. Ideal for high-impact applications, including doors, roof, floor, and trunk, where extra sound insulation is needed. Significantly enhances car audio sound quality and output by creating a sealed, soundproof environment. Stops rattles, increases SPL, and minimizes heat. Sturdy peel-and-stick aluminum backing allows for easy installation and conforms to complex vehicle contours. Authorized Internet Dealer. 1-year Manufacturer's Warranty. Dimensions: 18"L x 32"W (each sheet).