When I got the hard line for the brakes at the auto parts store it turned out I had 2 choices, 1 was the regular steel hard line or an alloy line (at least that's what they called it). Don't know much about it other than they said it was easier to bend and flare than the reg steel line plus I think they said it didn't rust either. I would've tried it out except it cost twice as much, not that it would've broke my wallet but my truck will probably be gone by the time the new line corrodes and fail again.