There are two types: neodymium magnets and samarium–cobalt magnets. Neodymium magnets – the ones used in our REMpedal™ – are incredibly powerful, permanent magnets made from alloys of rare-earth elements. Developed in the 1970s and 1980s, REM is the strongest type of permanent magnet made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.