Sizes : 3mm O.D to 75mm O.D. with thickness of 0.5 mm to 20 mm wall Background Sometimes called cupro-nickels, there exists a range of different copper nickel alloys that possess different properties and hence are suited to a range of different applications. Some of the better known copper nickel alloys include: * Copper with 10% nickel * Copper with 30% nickel All copper nickel