A planning magnetic disc consists of a basic magnetic disc and a plastic case. The basic magnetic disc inside a planning magnetic disc can only be magnetised one way: multi-pole.
A multi-pole planning magnetic disc has only one magnetised face. It is magnetised in a striped pattern of north and south poles e.g. north, south, north, south, north.
Planning magnetic discs can only be magnetised multi-pole due to the casing covering the top section of the magnet. This is because both the north and south poles are needed to be able to attract a ferromagnetic surface, which would not occur if the planning magnetic disc was magnetised in any other way.
Planning magnetic disc casing
The casing on a planning disc magnet covers two out of the three sides of the basic magnetic disc inside and is made from ABS plastic. ABS plastic (Acrylonite Butadiene Styrene) is a lightweight thermoplastic which has a colourful and attractive smooth finish.