These magnets are made from Samarium (chemical symbol Sm) which is element 62 on the periodic table. It’s a rare earth metal and forms one of the Lanthanides series. When added to Cobalt (Co) and Iron (Fe) the resultant magnets are strong.
Bonded Samarium Cobalt is made by using binders, such as epoxy resins, to hold the powder in place rather than sintering the alloy (compressing it under very high pressure into a mould). This means that they are less brittle than normal Samarium Cobalt magnets but also less powerful.
Here is just some of the uses that bonded Samarium Cobalt magnets have been put to:
Shop for Bonded Samarium Cobalt now
I don't think I can fault your services, you are very good, magnets were well packaged and post was also fast, I shall very soon be ordering some more magnets that are suitable for fitting to vehicle drain plugs, thank you very much.