Steel
2 3/4" long
Hong Kong

Not as sturdy as our Japanese counterpart, it also takes less space and would easily fit in your wallet for example. I could see a potential greatness in a robbery situation when you pull this out of your wallet instead of a library-card and some receipts when they ask for cash. Gotcha! Although if they take the entire wallet, tables will be turned and you will be in double-trouble instead. Mind you, it is much sharper than my mind.