I remember that being the very same grey/metallic plastic they used on my older boxed set minis i bought waaaay back in '92...was that 2nd or 3rd edition? In any case, those miniatures SUCKED, SUCKED, SUCKED :'(. The Thunderbolt had a hole in it's back from the screw up of the molding, the Battlemaster had one in it's chest I had to fill in, the Warhammer's left had a tendency to fall off because the peg to put it on was way too short. There were 24 of them and they included the Unseen.
I also bought the Clan Assault Mech boxed set (Set of 4) and I have to say they were even worse in their own way. They were blue plastic and, although the sculpts were excellent, they tended to be VERY fragile, like glass really. I ended up breaking off the Warhawk's long gun barrels, both arms of my Dire Wolf broke of and I had to refind and then glue them back on at the elbow, which is nearly paper thin plastic. The other two minis were relatively unscarred, but when you pay around $30 in 1997 for four minis that are supposed to be high quality, and they break like that, you get very upset and it even prompted me to write FASA a letter expressing my dissatisfaction.
In any case, you pay $60 for the set and you get 26 minis plus all that other stuff. At least they aren't fragile crap like the old FASA lance sets were and they should hold up to even a drop or two on hard concrete floors, my 24 help up nicely.