There have been a lot of requests for, of all things, an xkcd mousepad. So we made one out of an illustration from the back cover of the xkcd book, featuring various xkcd characters doing battle with the red spiders (which are not forgotten, by the way). It's 8.125"x7", with a vinyl surface on a 1/16" base. Other than that, I'm not sure what other specs to include here. By my calculations, it could probably bring down a fleeing human target if fired faster than about 400 mph, based on giving it the momentum of a fastball and about sixteen times the K.E.