Power magnet, Ring 12x5x12 mm. hyldeforkant Here you get a sign

Here you get a sign that is completely neutral white with black text on it (without a frame around it)

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to demonstrate magnetic fields with

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Power magnet, Ring 12x5x12 mm. hyldeforkant Here you get a signA strong cylindrical magnet with a hollow core. It is made of neodymium and has a nickel plated surface. The hollow core of this ring magnet measures 5 mm. (0. 5 cm. 0. 2 inches). This magnet has been designed to allow you to pass a cable wire, pipe, string, or rod through the hollowed core and create a magnetic surface. A practical feature if you decide you would like to hang up the cable wire, pipe, or strong without drilling on your work surface.