[greatmaul]

They're kind of multi-material, but mainly sort of a steel ring wrapped in rubber. I do imagine they might rot a bit but I imagine, like Water Warrior said, it's just as likely that once the oil gets around them the seals will rehydrate and be a lot better. It is kind of unnerving, though, to see your suspension leaking I know, but I rode mine to work and back a couple of times before I got the sealmates and everything seems fine.