What is One-side Magnets?

What is One-side Magnets? one-side neodymium permanent magnets assembly, neodymium sew-in magnets As we all know, naturally, permanent magnet has two poles: N and S. But, however, there are some occasions that need one-pole magnet, that is, magnetism on only one side of the magnets, or else, the magnetism on one side will disturb the [...]