Magnets made of Neodymium are far stronger than standard ferrite magnets. Their hold is considered permanent because of their magnetic field strength. This makes them a preferred choice for commercial purposes and an excellent option for everyday home school and office uses. Even the smallest sizes of these magnets form a very secure hold. Super-strong design holds documents and photos securely on magnetic whiteboards and any smooth metal surface. Small size won t interfere with your images or content....