It has no aluminum layer, is super stiff, and needs to be heated to become pliable enough to install. Looks just like OEM sound deadener that you see on floors. I pulled a bunch of large crumbs of it out of my friends door last year lol. I have installed it before and while it did a good job, I was worried after seeing that happen. So when I got into sound deadening, i asked manufacturers about it. Long story short, they only use it on the floor for a reason.
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