These magnets work great on the Quartet GLASS Magnetic Board. Some people seem to have trouble with that. I noticed that the "four" makes two almost identical products. The GLASS boards have rare earth magnets (if you look at the magnet, it's a bright shiny chrome color). Regular whiteboards have alnico magnets (the magnets are gray and will NOT stick to the GLASS board). Make sure you buy the right ones.
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