I can tell you about that...I built it!
It's a piece of RS800 mast, beefed up with UD at the business end and weave all over. There are carbon guide thingies for mainsheet and kicker, and it's set up to take a tubular RS800 style gooseneck.
It's actually the one pictured on SB on the front page of the main site at the moment, and you WILL NOT break it!