They are made from a revolutionary silicone rubber called Dragon Skin.
Dragon skin is very durable and elastic silicone making it perfect for both epoxy molding and for push molds for polymer clay.
The molds can withstand temperatures up to 400f so you can bake polymer clay in the mold if you like.
Since I make these individually they will be available in very limited quantities until I see if there is a decent market for them.
The current set of molds is approximately 2.75" outside diameter. This should give you a rough idea of the size of the finished piece.