Think of old James Bond movies. Picture Bond’s gadgets. They’re inconspicuous; in fact, they’re so designed as to be hidden from the enemy’s sight. But these gadgets are readily inaccessible and invaluable to the debonair spy, especially in life-and-death situations. Some of these gadgets are for self-defense.

Pen knives are gadgets that can also be used for self-defense. As the name suggests, it’s a knife that’s concealed as a pen. Because it is lightweight, you can carry it with you anywhere. It functions as a writing tool but hidden on the other end is the blade. You can also use pen knives to open mail or sealed packages.