A lot of new cars actually have plastic extruded over the steel brake lines for protection, both from corrosion and wear, abrasion, impacts, etc. I have several customers that do this in Michigan. First time I saw it, it threw me for a loop, as I thought the whole line was plastic!
We have some customers that require some tubing similiar to that. It has like a nylon-ish coating on it, the tubing with it we order is called procoat.
