This is a Flare Audio Isolate earplug.
It has worked brilliantly for me in reducing the noise. The metal is aluminium and its combined with a soft earplug.
So delighted with these I ordered a second pair and extra earplugs.
It doesn’t entirely cut off all sounds, but plenty enough. The ones the annoy me. The near constant ones.
My hands are big as are my ears, but these in my opinion are better than silicone ear plugs. Yes it’s strange, but I’m blue glasses guy anyway.
I take one out if I need interact. Otherwise both in and it’s great.