1.1 ,This specification covers technically important, commercially available, magnetically hard sintered and fully dense neodymium iron boron (Nd₂Fe₁₄B, NdFeB, or “,Neo”,) permanent magnets. These materials are available in a wide range of compositions with a commensurately large range of magnetic properties. The numbers in the Nd₂Fe₁₄B name indicate the approximate atomic ratio of the key elements.