When you want premium sound damping without the weight at 0.45 lbs/ft2 Stealth is comprised of a black aluminum layer at 4 mils with a lightweight butyl layer 9-Pack: 18” x 32” per Sheet 36sq-ft. total Stealth black aluminum Lightweight construction:0.45lbs/ft2 Self-adhesive Easy installation 25% Less weight Minimum Thickness: 1.5mm Aluminum Layer: 2 mil Peel Adhesive Strength: 38.24 lb/in after 24 hours Application Temperature: -60F to 300F