... ,N42,N45,N48,N50 1.shape:ring 2.neodymium permanent magnet 3.nickel,gold coating 4.application:jewelry Specification1) NdFeB ... Magnet GradeN40Density7.5g/cm³Remanence/Br1.26-1.30TbHc836-891kA/mjHc955kA/ ... /Western unionmore details about NdFeb magnets: NdFeB permanent countersunk hole magnet with N42 Grade zinc,nickel coating