Cunifer sounds like it's got iron in it as well. Cu - Copper, Ni - Nickel, Fer - Ferrous or iron.

According to this it does contain a bit of iron (only 1.3%), but it's alloyed (mixed) with the copper and nickel, not a plated steel line.

I used CuNi lines for my truck, except for the larger line from the master cylinder to the first division block, where I used a coated steel line from my FLAPS.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.