Replacing transmission lines

There is a soft bendable tubing available in coils but it has to be made of some alloy, aluminum, lead, or who knows ?
the correct steel tubing is unforgiving. Bend it wrong or kink it and restrict flow, toss it and start over.

I'm assuming your talking about Cunifer from fedhillusa.com? Great stuff, I used it for brake lines before, but pricy for this application.