What does the Piston do?

The Piston is a satisfying fidget and a work of engineering joy. It allows you to experiment with an aerodynamic bearing which provides a smooth motion and tactile feedback. Basically, it's loads of fun to play with! 

The Piston is machined to a fine tolerance which means there's no friction between the pin and the cylinder which can be used for all kinds of fiddling, from spinning to bouncing to launching!