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Hop up rubbers are made of different materials, rubber (like the Madbull blue ones), silicon (I assume the Guarder clear are this) and other compositions. Haven't seen any hop up rubbers crack, mostly tear.
Interesting, I ran the chrony at the Mill game on Feb 28th and it was maybe about -15C outside, so inside the building was roughly -10C at the lowest, and out of the 40 odd guns I chronied, some sat normally, say decent 300-350fps, as one would expect to see, but about half to 2/3 of them I'd read much lower and varied fps, I think the lowest was about 175fps......... the owner was stunned because it's a 330fps gun, I said likely due to the cold and the type of material used for the hop up rubber, chances are nothing was wrong with the gun. And all guns were tested indoors at a distance of 150ft by those that shot lower than expected and the BBs travelled fine for distance. And yes, there were a couple cases of BBs plugging up (aka. not entering the chamber) in the hop up unit, a couple drops of oil cleared each and every one of them.
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