Since the above eBay page will eventually go poof, here is a screenshot for your reading enjoyment. Click the thumbnail for the larger image (sorry for the size of the image, I wanted you to be able to read the description, it's a hoot!).
It's hard to determine their size from the picture, but they look a little big. I don't think I've ever seen a squirrel running around with things like that hanging down. Or are squirrel genitals internal?
There was a male squirrel who used to frequent my picture window feeder. They do carry around some rather inpressive nuts (pun intended). From a distance I guess I had never noticed this before, but getting a close up view through my picture window gave me a whole new appreciation for the little guys. Having anticipated a question concerning the exact size I had snagged another picture from the auction.