I don't see the problem. Nowhere in the description does it say that it's graphite.
Those tuners, incidentally, have their pros and cons. Stringing is dead easy, you just put the string through the middle of the knob. Saddle height adjustment is more awkward, you have to screw the actual saddles up and down, like a Warwick Just-A-Nut I. Intonation is also awkward, as the anchor screw is under the string so you have to move the string out of the way to adjust it.