JFP in PA is right.
This brake lines are reusable as long as they are not damaged by an accident, by rust, or something else. If the line has corrosion, please allways replace it. Take care of the tip. This has to be 100% intact. Else please replace. If you not 100% shure, replace it. Brakes systems are essential for your and others lives.
Don't make savings at the wrong spot.
Regards Markus