The strongest permanent magnets in the world are neodymium magnets. Neodymium magnets are manufactured in a number of different grades, some of which are more powerful than others. The strongest grade currently commercially available is N55 grade neodymium. The rectangular and square magnets in this section are all made using N52 grade neodymium meaning they all have incredible strength for their size. These magnets should only be handled by people who are used to handling strong magnets and once a thorough risk assessment has been undertaken as they will easily crush trapped fingers causing serious injury.