No. They're stainless, I think.
Someone will correct me I'm sure.
Either way I've never had one corrode. I'm sure the rubber will perish before that could happen.
I'm not sure if there stainless. But I work with car tyres and hate when people don't use valve caps on Schrader valves so I use them on presta out of habit and worry!
@dazzrie started
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No. They're stainless, I think.
Someone will correct me I'm sure.
Either way I've never had one corrode. I'm sure the rubber will perish before that could happen.