These cone magnets are neodymium magnets with special features: The magnetic flux lines are bundled on the small circular surface (10 mm), and therefore the magnets possess a high adhesive force (approx. 5 kg!). The base area has a diameter of 20 mm. The north pole is located on the small circular surface.
Cone magnets are perfectly suitable for the use on whiteboards, magnetic boards and other metal surfaces: The stump holds notes on the surface, but the magnet can be removed easily by turning it sideways. When you place the large base on a metal surface, however, it is hard to remove the magnet.