Oem Spec - Automotive 5/16 Copper Cupro Nickel Brake,Fuel, Transmission Line Tubing 25 Coil - 1 Roll. This Is One Roll Of 5/16 Copper Nickel Brake Fuel Transmission Line, Used For All Automotive Applications, Automotive Spec 5/16 OD, .028 Wall Thickness. This Is The Softest Tube On The Market - Bend By Hand, Flare With Any Flare Tool - Even Th eCheapest Lowest Tool Will Still Flare This Tube. Easy To Work With. Worth The Extra Cost Over Zinc Or Stainless If you Are Bending Your Own With No Experience.