Well, they are skeletons in general, but they appear still to have leathery skin clinging to their necks. Which is a bit odd... but probably means their necks won't snap off first time you drop them.
I wonder how they would work if you painted them as if they still had the skin on, but were ... desiccated, is that the word?
I think they work great as skeletons, mind you... just don't think about those necks too much. The studio paint jobs also treats them as skelies.
-Michael