Nico,
What he's talking about is a true hollow tail. The worst one that I've found actually had a HOLLOW TAIL. There was no material in there, just a big air pocket. But the majority just have an empty space inside that runs all the way into the tail, then stops. And to top that off the paint jobs have taken a serious dive in the last few months. I noticed that the colors were getting lighter and the spots were diminishing but didn't realize how drastic it was until I got out a new bait from 6 months or so ago.

Matt