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2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache.

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Small silver sponge fell off logic board

I replaced the speakers on my 15" MBP 2015 yesterday, and when all done, I found this small silver colored sponge (see photo) had fallen off the logic board, but I'm not sure where it fell off. There were a couple of those on the board, apparently serving as some type of a cover over screw heads. But the material is curious, if it's just a cover (why not just use rubber). Anyone know what it does? Thanks.

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Oh, one more thing. There is a small triangular rubber flap that covers a set of screws (see circled area in photo). There are two, one on each side of the laptop. I'm missing one. It's not critical, is it? I put a piece of electrical tape over the missing one.

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Thanks!

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This is a conductive EMI energy transfer gasket. It's used to offer a pathway between two parts and/or fill a void which EMI emissions can exit the system. Here's a deeper write up Design Guide for Reducing Radiated and Conducted Emissions

I don't remember encountering the EMI disc when replacing the speakers But I do remember them being present under the heat sink to drain off the charge built up within it from the CPU

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it is a heat spacer u can put it on or leave it off I mean it's not critical

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