Grade:N35,N38,N40,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/mMax Energy/BH302-318kJ/m³2) Mechanical CoatingZinc/Nickel platingSizeCustomized size are available3) Environmental Working Temp.80°CPacking11.5*8.8*5.8mm white ...