They're supposed to be non-magnetic. Where did you read that cupronickel is magnetic?
The 5 cent coin has a lot of composition changes over they years. 1858-1919: .925 silver 1920-1921: .800 silver 1922-1942: pure nickel 1942-1943: tombac 1944-1955:chrome-plated steel 1946-1951: pure nickel 1951-1954: chrome plated steel 1955-1981: pure nickel 1982-2000: cupronickel 2000=present: multi-ply plated steel
A regular circulation 1986 nickel would be non magnetic. The reason why it is specified on this holder is purely for the sake of attribution because it is struck on an unknown planchet. (Eg; it could have been struck on an unknown magnetic planchet).
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