The sections from the head are being cast seperately.
The mold will be injected with silicon. The wires in the mold create channels to allow the air to escape as the rubber is being injected.
Lego is used to create an easily assembled and disassembled case. Silicon mold rubber is poured over the pieces.
Once dry the mold is turned over and the clay cleaned out. As before, a layer of vaseline is used as a seperating agent to stop the two halves of the mold from adhering to each other. The finished mold is a two piece mold.