... grades:N35,N38,N40,N42,N45,N48,N50,N52 round magnet with custom hole guaranteed quality NiCuNi,Zn,Epoxy N35,N38,N40,N42 ... ,N45,N48,N50,N52 round magnets with holes, Any size Product specifications ... :1. neodymium rare earth round magnets with holes are with material grades of N35,N38,N40,N42,N45,N48 ...