Some of the disc magnets in the Frenergy catalogue have a mark on one side. This mark can be a pen mark or a dimple applied to the magnet at the factory. The mark invariably indicates the North pole surface of the magnet. The South pole is therefore on the opposite side.

The flow of the magnetic field travels from the South pole area to the direction of the North pole. Some alternative health practitioners say the field can be applied to certain areas of the body to assist or improve blood flow which can help fast track the healing process. In their opinion, the North marked pole face should be applied directly onto the skin to have the most beneficial effect.

The North pole marker can be extremely useful when arranging two or more magnets so they either repel or attract each other. The mark can be used to identify each pole when the magnets need to be arranged correctly and then afterwards permanently fixed into place. Having the poles facing in the right direction can be crucial in many circumstances and applications.