- R400408N45Dimension: 1 1/4" od x 1/8" id x 1/4"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$8.73R402404N45Dimension: 1 1/4" od x 3/4" id x 1/8"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$6.98