Neodymium treads in a container. Strong Neodymium NdFeB magnets are embedded in a metal container. This metal housing protects the neodymium magnet from shock and vibration and increases its attractive force. In order to achieve the optimum attraction force, the tread magnet must be directly in contact with the metal surface. A thin sheet of iron or paint can reduce the attractive force of the magnet very quickly. The adhesive force acts only on the open side of the magnet, as the steel container protects the other side of the magnet. You can also find lower magnetic attraction ferrite treads in our range. A special feature of magnetic coils in a container is that: Due to the lack of a hole (placement option), these pot magnets are often placed (nested) in holes. Their maximum operating temperature is 80°C You can see the cobalt samarium treads in case your application needs a high temperature resistant magnet.