Is that dark foiled material or just the light of the shot that makes it look that way?
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It’s actually black, found it on amazon
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Can you link what you found? it looks great, I was never a fan of the silver foiled material.
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https://www.amazon.com/SGM-18-sqft-Mat-Automotive-Deadener-Audio/dp/B09RSV974G
Free shipping to NZ if you can fill the cart to above US$49 
I have a question, would it be effective on the outside of the case, or is it more effective inside? I feel like it would be easier placed on the outside.
it works by adding mass so that the wide flat sections are harder to “excite” - it will work just as well on the outside. Probably better because it’s easier to apply properly.