- R240402N45Dimension: 3/4" od x 1/8" id x 1/16"Material: Sintered Neodymium MagnetGrade: N45Coating: NiCuNi(Nickel)$1.21R240404N42Dimension: 3/4" od x 1/8" id x 1/8"Material: Sintered Neodymium MagnetGrade: N42Coating: NiCuNi(Nickel)$1.73