The busts are made from a really nice soft, translucent, tin catalysed silicone and they're painted and sealed with professional special effects makeup.
The facial hair - eyebrows, eyelashes and Hudsons goatee - can be painted on for a little bit extra but any hair punching will cost alot more. I would recommend that each person try their hand at punching hair themselves, as even the most amateur job would add more realism than painted hair in my opinion. As for the head, I would recommend punching in hairs around the hairline and adding a wig for the rest.
Each bust is cast on a hollow fibreglass core with a handy 32mm pipe connector fixed to the inside as a part of the casting process. This can be used for attaching a stand or attaching it to a mannequin.
The eyes come blank as a part of the fibreglass core and require a little filling where the screw holes are before painting. You can also drill them out and replace them with glass/acrylic eyes if you like. But you would need a little dremelling skill and you would have to be careful of the silicone. Also be careful as the fibreglass can be sharp