Rubber Monster 4's head comes from a tourist statue from Hawaii made from volcanic rock. It was half of a pair of statues of a chubby elderly couple that was around my parents' house for years and ended up in my possession. I got rid of them when I moved, but not before making a mold. That mark above her right eye was unintentional, probably the result of placing the piece too close to another, but it reminds me of schizophrenic rock god Wesley Willis, who developed a darkened calloused spot on his forehead as a result of affectionately headbutting his friends and admirers.
Rubber Monster 5 has the head of Skeletor.
I don't know the source and context of this Rubber Monster 6's head. I found it in a box of action figure fragments at R Galaxy in Tucson.
