They're made out of foamcore, some expanding foam, and paper pulp mache. It needs a LOT of sanding, and probably a bit of reshaping. I had trouble even with the pattern getting these to look right, proportionately, so they will never be up to my usual prop perfectionist standards; however, I think the overall effect will be great. I'm going to try to get them to have a bit more of the skeletal feeling the scissors in the artwork do. The pattern was a bit of a compromise between the box art and a photo of a Casper figure I saw. They also won't open and close like my other scissors; the design is just too weird, and they'll be better served as a static prop, I think.
The scissors as they're pictured here aren't assembled at all. They're just pieces stacked on top of each other.
Please excuse the dirty floor >_> it needs a vacuum. Also, I have the worst vacuum ever. Can't wait to get a new one when I move!