They aren't plastic - they are metal and painted. What the material is depends a bit on which hand. The sub-dial hands and the chronograph seconds recorder hand are made in 2 pieces - the pipe and the flat portion of the hand. The pipes are steel and are attracted to a magnet, where the flat portion of the hand is not. I have an old chrono seconds hand and the back side is a white metal, and when I scratched it, it appears to be white all the way through. Possibly aluminum...not sure...Omega does not identify the metal used.



The hour and minute hands also have a short pipe on the underside, but those appear to be formed as part of the flat part of the hand, so it appears to be all one material, and again is white metal.



Cheers, Al