We also have Laertius 43a. "for [Epíkouros] states that division [of atoms] does not happen further ad infinitum, even though (as he says) the Qualities are transformed – unless Someone is also going to extend those [atoms] completely ad infinitum in [terms of] size"
and Laertius 44b. "He says within [his books], that no Quality at all for the atoms exists except shape, size, and weight – that Color varies with the position of the atoms, he states in the Twelve Elementary Principles – and that concerning them every Size does not exist: never, at least, has an Atom ever been perceived by sensation"