- C1010N40Dimension: 5/16" dia. x 5/16"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$0.86C1010N52Dimension: 5/16" dia. x 5/16"Material: Sintered Neodymium MagnetGrade: N52Coating: NiCuNi(Nickel)$1.38C1012N40Dimension: 5/16" dia. x 3/8"Material: Sintered Neodymium MagnetGrade: N40Coating: NiCuNi(Nickel)$1.03