Here is some more info I found. Product Review: Nanoskin Autoscrub Foam Pads | Ask a Pro Blog+1
NanoSkin AutoScrub Foam Pad | Ask a Pro Blog
Still trying to figure out if I do by hand do I really need a 6" or can I just use one of the speedy prep pads. I think I might try a speedy prep pad first, then later invest in the bigger pads.