On the left is a CD 131 with a nice sealed bubble... an eBay purchase that had a very dull surface from being buried. Denny Hackthorne tumbled it very nicely! The one on the right has the biggest bubble I've ever seen, though it's a bit hard to tell since it's so dark. Using a tape measure to wrap around it, I get 5-1/4" wide by 2" high! It is open to the inside by a very small hole. The inner skirt is completely "collapsed" on this one as well. Very strange.