Its a copper/nickel mix. i dont know what nickel % is, but we have been using it since thw WW2 so im not to worried about that
Its what we scandinavians commonly use for brake lines. We drive in snow, salt and summer conditions, ive never ever experience any problems with the brake lines.
Thanks Havard.
Seems like it is superior to steel too.
Here's a link:
Copper.org: Applications: Automotive - Copper-Nickel Automotive Vehicle Brake Tubing
Learnt something new.
(I wonder if the local inspection system here would accept seeing copper brake lines in use in this country?)