Ferrofluid Display

The Nano 2.0 is constructed of glass with a magnetized screw in the center that the ferrofluid naturally spins around. Comes with a magnet. The magnetic top is sealed shut and stores the magnet when no longer in use. Ferrofluid is a magnetic liquid that spikes in the presence of a magnetic field. This display is small, but lots of fun. The volume of the bottle is about 15 ml.