Hi Ted;
I believe that the plasma is a sprayed on ceramic coating, either on the piston, or the liner bore, or maybe even both, but I think it is only on one part. They are supposed to wear forever. I have some Fox .35 piston and liner sets that I think Toni did that I got from someone else a while ago, but like you haven't had the chance to use them yet. I think even Fox had a .35 available at one time that was ceramic coated. I may be wrong, but maybe someone more versed on the subject will jump in.
Type at you later,
Dan McEntee