Johan, that is in fact the 'real deal', that particular blank is special because they have to be made specifically for a particular 'kit', and I've never seen any other in that type of pencil, I got it from a guy of the penboards. It's made by gluing a 'shed' snake skin blank to a painted brass tube, then the entire tube is encapsulated in clear resin, it's an expensive process and not many people make them for that reason

Hey I like the idea of the 'fangs' coming out once you press the top

Maybe Robert will incorporate that idea into a puzzlebox someday
