For the realization I used readily available materials. Of course you can wander with the imagination as rigualda the body of the pen, the important thing is that it is metal.
An old slat curtains. (the one that stretches with two holes at the ends)
A clip of a pen to throw.
A piece of foam anti-static. (This is the gift you can ask a store of electronic materials. In short, is the foam that protects the pins of the ICs from electrostatic charges.