Alright, the results are in.
Prodex Total observations:
Thickness: .125 to .187" (3.175 to 4.7625mm)
Weight: .48oz (~13.61g) for an 8" x 10" sample piece (there was a sticker, slapped on the surface, covering almost half of one side, that I couldn't entirely remove... weight should be SLIGHTLY less)
So, if I did my math right, a 24" x 74" pad would weigh ~ 10.66oz
That's all I've got for now...