I got 4 sprues of these guys from a Castle Craft box which I bought. They are nominally 28mm, which in this case means the figures measure 28mm from their soles to the top of their heads. They are definitely too small to go with other "normal" 25 or 28mm gladiator figures, but if you are building an arena, it occured to me that they might do very well as statues (perhaps of famous gladiatorial stars?).
Let me know if you want a sprue, and we'll see if we can work out a trade.