oh. it's relatively plastic with a slight texture - very quick and low resistance. i use a Sensei with 1350 cpi (sensitivity "1" in config) and it works really nicely to be able to move mouse quickly and smoothly.
Just received my new pad in the mail...this thing is even better than the original F10!! Very finely-textured surface, semi-rigid (!), and quite fast/low drag. Love it.