The magnet is only protected by a thin layer of nickel

so they works best on whiteboards or metal boards

As you can see in the photos

Ghost Magnets

Magnetbånd Gråt, 30 mm. x 1 m. Auto-translated (NO) The magnet is only protectedMagnetic tape in gray of a full 30 mm. without adhesive. The magnetic tape is delivered on a roll with the number of meters you need. The price is per. running meter. NB! You must make sure to turn the magnetic tape correctly as it has a very magnetic side and a not so magnetic side. The highly magnetic side is the one without a line in the middle. So if you find that the magnetic tape doesn't "work", you probably just turned it the wrong way. We