The handles and pivot pins are made out of layers of regular card stock and the latch is magnetic.
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I have gotten the chance to use the key for a while though so I can tell you what it is like using it.
First, it is very fun to have and show to your friends. The only bad thing about this is that you have to be careful when your turning your key in the key hole.
There will be more information about the experience with this in the instructable. Hopefully I can give it to you guys soon, but school and mid terms come first.
1) What exactly do you mean by card stock?
2) Does this work as a normal butterfly knife? Can you still do tricks?
3) Nice Job! It's a good looking mofo