the grey + baby blue tuffs were the last colours skyway brought out ,so don't think they would have been made with a alloy hub ,as brummie said they came with a rear coaster hub -mine are a uk made set and have a bolt in rear coaster .
the only other option if you've seen one with a metal hub front is that some body has fitted it themselves-see pics on my white streetbeat for a pair of these.
as for the tuff pads think skyway just made both the freestyle pads and tuff pads in all tuff colours