If im right they are stainless steel. You can get these from felgenfuchs.de. Not a fan myself but if you like them..get them
Purely for aesthetic reasons, just wondered what the general consensus was. Felgenfuchs.de quality should be good, sourced my Radinox lips there. Personally I quite like them, but not enough to rebuild my RM's..... probably best suited to a rat look.