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hs5 is pretty tight lipped about what material is used in the r-hop and ir-hop patches... I imagine is pretty common tubing cut down the length to get the patch. IR-hop feels closer to a silicone material than a rubber as it's fairly clear.
as an aside, in my p90 I believe I have a ir-hop and lonex 50 degree vs my g36 with a ir-hop and lonex 70 degree. I haven't really cold weather tested either gun. The coldest I got the p90 was nightfall which I think was low to mid single digits in C mixed with really miserable rain.
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