What is there in rattle tail

Actually, there is nothing in the tail. what happens is every time the rattlesnake sheds, a small piece of the old skin wraps around the previous on at the end of the snakes tail, forming a series of small bulbous appendages. When the snake vibrates it's tail back and forth, the appendages clatter against each other producing the sound. Yes, rattlesnakes are dangerous, but not because of the rattle. The rattle is merely a warning tactic the snake uses to ward off enemies and predictors. What makes them dangerous is the other end of the snake...it's fangs and venom.