Inline Tube (L-5-5) 1/4" Cupronickel/Copper Nickel Brake Line Tubing Coil, 25' 1/4" Copper Nickel Brake Line 25' Coil This is one roll of 1/4 brake line .028" wall thickness Wall thickness = .028 (.70mm) Elongation in 2 (50mm) = 14%