Maxima Strong Neodymium Ring Magnets N35,N40,N42,N45, N50 & N52 For Sale Neodymium Ring magnets come in many sizes. Ring Magnets Permanent Magnets Rare Earth Strong Neodymium Ring Magnets for Sale hobbies and industry no minimum Order. NdFeb or Neidymum magnets various range in size from less than 1/4 inch in diameter to well over 2 inches across. Our Strong Neodymium Ring Magnets have a special set of uses in the world of magnets. Ring magnets are specially suited to those magnetic repulsion experiments where you dangle 2 magnets from a string, but also Jewelry and in the medical field. One magician we know even wanted one that looks like a wedding ring. Hmmm, the methodology for the trick would be hiding in plain site.