Still available in the States from Historifigs, these figures are small, "US 20mm" figures, similar in size to, for example, Thomas 20mm, or among more recent manufacturers RSM or Newline 20mm figures. Scruby's 25mm figures are more compatible with traditional UK 20mms.
In this article from The War Game Digest, Fall 1971 David Rusk considers some of the main Ancient nations with reference to the Scruby range.
I don't know if Mr Rusk ever wrote part II of this article (see final page), to cover Romans, Carthaginians and others; if so I don't have a copy of it.
This article has been spread across two posts.