Neodymium-disc magnets and neodymium magnetic disks are small however very strong magnets which are suited very well to close something. 

Whether as a fastener in pockets, briefcases, folders or mobile phone pockets, the possibilities are varied. 

The neodymium-disc magnets and neodymium magnetic disks are available in different dimensions and strengths. Moreover, you can choose between normal one and a self-adhesive implementation. 

And so simply use the self-adhesive neodymium-magnet discs and neodymium magnetic disks: 

If they take two neodymium-disc magnets on each other, draw off the foil and stick the disc magnet, for example, on the inside of a folder. Now you draw off the foil in the other disc magnet and press both magnets against the opposition. The magnet fastener is ready.