Unlike Neodymium Rare Earth magnets which have a polished silver coating, Ferrite, or Ceramic Magnets have an unattractive dark-grey colour and they stain under friction. Ferrite magnets are stronger than Alnico. However, they are a lot weaker than our number one seller magnets, Neodymium Rare Earth Magnets. Unlike neodymium magnets the weaker properties of ceramic magnets makes them safer around electronic devices like pacemakers and hearing aids. Having said that, we still recommend a safe distance for both magnet types.