Great thickness (2 mm) for maximal effectiveness. The thickness of the material is providing an extra 50% insulation performance. This thick and long-lasting butyl material will outlast most similar products in the market. The automotive self-adhesive butyl mat will stop ambient sounds and noises. The average weight is 0.7 lbs/ft2. This has been shown to deliver optimal efficiency and maximal performance among all similar material with a thickness of 2 mm. Easy installation. The sound dampening material is served in a pack of 5 sheets. This will make your life much easier when cutting and installing the sheets on the panels to be insulated. You will notice the difference provided that the sound-proofing sheets are installed as expected. No-mess installation. Canopus noise/sound deadening sheets will be assured to be installed correctly provided that the surface of the application is cleaned out and the area of contact is rolled over with an appropriate roller. Package includes 5 sheets (36.8 mm x 25.4 mm each), total 5 sqft.