I certainly don't doubt what this means...but the diameter, essentially of an elastic item is no real way to measure cock size or even girth really, hahaha. Leave it to the Thais to come up with such a method. I guess it's such a loose definition of a cock size that it could make even a small cock seem big, lol. I actually love small Thai cocks on bottom boys anyway and could careless about their size really...but that's just me of course.