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6" x 6" Magnetic Field Viewer Film: $19.99
You are buying one 6 inch x 6 inch sheet of Magnetic Field Viewer Film
The film is highly flexible and can wrapped around objects. The film can also be laminated. It is not currently laminated.
Encased within the green film are millions of magnetic particles suspended in oil. A magnet will attract the particles to the areas where the magnet is the strongest - at its poles.
The poles appear dark green
Multiple pole magnets such as those on business card magnets will display interesting patterns, such as the example pictured below.