I just looked at  my new kit and it appears to be 1/16" push rod "z" bends on each end..Hope that this helps...

        I seriously wouldn't bother with a carbon tube on a Skyray. I have built more Skyray's than any other 1/2A I've ever owned. I never checked this directly, I always felt that they were tail heavy right out of the box.  I always found them to be twitchy. The stock control horn is too small which could be a contributing factor to the twitchiness. It can work as long as you slow the controls down by using the inner most hole on your bellcrank.  The end result is that the nose breaks off directly on the leading edge of the wing. I have made 1/64" ply doublers prior to the cheek blocks being glued on which does offer more longevity of the nose.  After you CA or epoxy the nose back on in or around the 3-4 th time, the plane flies with a lot more control. The single screw that holds the elevator control horn can turn due to pivoting on the screw and will ultimately jam your control system. It's a poor design and due to no footprint area which can pull through the elevator. A Dubro small control horn is a good option due to being larger offering more adjustments and also a bigger area to seat.