There's no number imprinted on it. I don't what size they are but, I noticed in the view larger pic. that they are so close to the exact size, maybe you can judge that. The listia pic. is just 'slightly' bigger, very slightly. I hope that helps. :)
That doesn't help. If you could, you should bring it to a local yarn shop (I don't mean Michael's) and ask them what size it is. Then, people will bid.