It would be nice if Hot Toys would just disclose what the jaw material is but I'm 99.9% sure from all these close up pictures that the jaw material is a painted silicone rubber piece, which sadly is deterring me from ordering it. I understand why from a aesthetic design standpoint but I had that previous alien they did and wasn't a fan. The paint rubbed off day one and the jaw came unglued immediately... just irritating to pay so much for these toys and elements of their design aren't built to last or just have inferior materials.
Damn, I really liked the looks of this one too...