One of the most constant design features of ballpoint pens is the cartridge release and retract mechanism. This is typically managed by pressing either a button on top or the side clip. Enter the shake pen, which adds a fun new way to get your pen ready for action. With a shake of the wrist, the tip emerges. With another shake, it retracts into the pen body. Now every student can master the slick dexterity of a gunslinger.