Nicolette : Hm. I have no idea what's different in your case, but when I measure from the tip to the second to last dot (that is, the dot that is farther away from the curved tip and closer to the base), I get 5.5". I don't *think* Soul Source has changed their dilator design, but mine are in fact 2.5 years old, so it's possible, I guess!
To be fair, I'm also measuring using a tape measure, as it seemed to be more accurate than a flat ruler for a curved item. It's entirely possible that *I'm* wrong.