Always be prepared to handle a potentially dangerous situation that can be averted just by having the right weapon. Pen knives are real pens that can save lives. They look like ordinary pens but hides a 2.13-inch blade inside which can be revealed by pulling the pen apart. Thanks to their unassuming appearance, these pen knives are easy to conceal.

Take them with you just about anywhere. No one will suspect that your expensive looking writing instrument actually contains a small knife underneath it. Keep one in your shirt pocket and another in your bag within easy reach. Pen knives can be used for writing and come in black, silver or gold colors.