Each display comes with 2mL of ferrofluid in a specially configured suspension liquid to keep it "spikey". The ferrofluid is permanently magnetized by 3 magnets embedded in the base. Using the magnetic stylus, you can move the ferrofluid to make very dramatic stringy spikes. The top of the case is magnetic and is designed to hold the stylus in place when not in use. In addition, the background is brightly colored to contrast with the ferrofluid making the spikes pop out.