Flying wires. Thats what Tower calls them. You can make your own using these http://www3.towerhobbies.com/cgi-bin...?&I=LXCLZ1&P=0 and metal clevis's with threaded inserts OR the kit and kaboodle http://www3.towerhobbies.com/cgi-bin...?&I=LXFV30&P=0 . Make sure you put the backing nut on to lock it.
I've done solid rod and wire and it just depends on how you're going to fly it. On the 4*, you probably dont need them. But they dont hurt anything. I was stripping down my Rascal110 a few weeks ago to recover it and discovered a serious crack on one side of the fuse. Without the flying wires I had there I would have lost the plane. Didnt know it till I stripped it.
Edwin