Manually self-operated butt-kicking machine http://www.google.com/patents/US20060094518?printsec=claims#v=onepage&q&f=false Believe it or not, it's patented. Why? I really don't know.
...or, at the very least, nice and clean. You can get a blade looking new with just a few swipes of a wet washcloth...
I don't think this captures the true volatility of the Astras on Amazon, but it's interesting nonetheless. Green is Amazon, blue is 3rd party: