Anyone know anything about a Pro boat Mini V?

I'm looking for Miniature universal joints. I found a reference to a "Pro boat Mini V" u-joint and discovered that a Pro boat Mini V is a radio controlled Miniature speed boat. Would anyone know any particulars about the u-joints? I'd like to know what material they are made of, how they attach to the boat's drive shaft (set screw etc) and the size of the drive shaft. Thanks.