Well Like I said, it is made of metal and has a lid that hinges. It fits tight enough that it just stays closed (although I have bent the inside lip ever so slightly to add just a tiny bit more tension on it) Works really well for me. I found it at a flea market and have had my eye on it for over a year but wouldn't pay the price. The finally reduced it by about half (to $6.00) so I quit messing around and bought it after I figured out it would make a good edc fak.