A friend brought these over, can't say I've seen these before, max burn speed 40x on my 52327S.
And yes, they are Postech, not Prodisc.
My guess in the POS part is fairly accurate...
So, Postech, Prodisc, CMC, TY. Can't they just make up their freakin' minds!?!
EDIT: Postech, not Posdisc. My bad!