- B202004N40Dimension: 5/8" x 5/8" x 1/8"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$1.73B202008N45Dimension: 5/8" x 5/8" x 1/4"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$3.13B202020N40Dimension: 5/8" x 5/8" x 5/8"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$6.98