Because some occasions only need one side magnetic, the other side if there is magnetic will cause damage to the product itself or interference, so this time it is necessary to use a single-sided magnet. Like some occasions such as packaging box on the magnet is only need one side magnetic, the other side is optional, there is no magnetic use, so the use of one side magnetic will greatly reduce the cost and save magnetic materials. In the magnet industry, the nature of single-sided and double-sided magnetic are the same, are ndfeb magnets, but is a single-sided magnet in terms of cost is relatively low, is assembled by an iron shell of a magnet combination, so wrapped on one side of the magnetic will be shielded, magnetic force is refracted to the other side, the other side of the magnetic will be enhanced.A double magnet is a plain wafer magnet that is not wrapped.