... 56%, Ni44%, ribbon wire Product: Constantan Flat WireGrade: ConstantanChemical Composition: Copper 56%, Nickel 44% Electrical Resistivity; 0.49 ohm mm2/m ... produce other kind of copper nickel alloys, such us CuNi2, CuNi6,CuNi10,CuNi23, etc. Producer: Shanghai Tankii Alloy Material Co., Ltd. Constantan Flat Wire