The rods are just wood dowels, painted black. A groove is drilled about 3/4 of the way down the dowel (using a milling machine, or something similar) - at the end of the groove, a hole is drilled through the rod, and a slot (about an inch long) is drilled back up the dowel on the opposite side. The rod is fitted into the slot, and is pulled through the hole and bent back up the other side to stabilize it. The whole thing is then wrapped in gaff tape. It takes a bit of work, but the end result is good.