Product Name: Ferrofluid Magnetic Display Contents: Glass bottle (containing ferrofluid and base liquid): 1 Neodymium magnets: 4 (2 with handles) When a magnet is brought close, spikes form from the ferrofluid (a spiking phenomenon), making the flow of magnetic field lines visible. It's fun to change the shape of the spikes by moving the magnets closer and further away. Shipping will be via Takkyubin Compact. Thank you for viewing.