WARNING:
Keep away from children; Do not put magnets in mouth or nose; Swallowed magnets can stick to intestines causing serious injury or death; Seek immediate medical attention if magnets are swallowed or inhaled.
For ages 17+, not a toy
Desktop boredom buster for science-based amusements
Use the magnets to move the ferrofluid around and observe its behavior
Utterly attractive and awesome
There are some black precipitates in the bottle that are normal.