- R120312N45Dimension: 3/8" od x 3/32" id x 3/8"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$1.56R120402N40Dimension: 3/8" od x 1/8" id x 1/16"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$0.33R120404N40Dimension: 3/8" od x 1/8" id x 1/8"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$0.51R120612N40Dimension: 3/8" od x 3/16" id x 3/8"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$0.86