Um, no, you're not missing anything. The label says "Spinner, Assembly in SS.-"
These are the ones you want, in stainless steel.
I had a set of these on my car before I sold it. First class products and Enzo/Paula are great people to work with.
BTW, if you don't have a spinner tool:
http://www.cobraaccessories.com/cata...roducts_id=263
you may wish to get one. You'll also need a 4-foot long, 1" diameter cold rolled steel bar to go with it, available from any metal fabrication shop.