I always thought it was plastic. It's not.
It's made from cellulose, which are plant fibers. They usually use wood, cotton or hemp.
If you care, you can read up real quick on wikipedia
right here.
I actually found this out from a free app I installed on my ipod touch called "Cool Facts". I was smoking a cigar while I was getting tired put on my car the other day, and scrolling through the facts when I saw this one.
Thought you guys might find it interesting.
