I don't see the dimensions on their site, but memory tells me they were 5" rollers at 1.5" in diameter, though I seem to recall there was some dispute over whether they were actually 1.5" in diameter. I think some people measured a *slightly* smaller diameter. And by slightly, I mean 1 or 2 16ths of an inch.
I emailed Rebel about 2-3 weeks ago and received the standard "stand by, we are working on it" message that others have. Was also told to keep an eye on HBT and that "rest assured we will let the world know when we have an update."