Nickel-copper alloy is very flexible making for super easy bending & flaring for installation - You can hand bend our brake lines with no bending tools needed Corrosion and Rust Resistant: Copper-nickel alloy resists rust, road salt, and moisture far better than standard steel brake line tubing. These lines are well-suited for vehicles in high-humidity environments, coastal regions, or areas where roads are regularly salted in winter. SAE and ISO Certified: This tubing is tested and verified to meet Society of Automotive Engineers (SAE) and International Organization for Standardization (ISO) specifications, ensuring reliable performance and compliance with industry standards. Complete Kit with 16 Inverted Flare Fittings: Includes 25 ft of 3/16" copper-nickel tubing coil and 16 inverted flare fittings in the most commonly needed sizes: 2x 3/16" (7/16-24), 10x 3/16" (3/8-24), 2x 3/16" (1/2-20), and 2x 3/16" (9/16-18) tube nuts — everything needed for a complete brake line replacement. Ideal Replacement for Steel Brake Lines: Copper-nickel brake line tubing is a direct replacement for steel tubing on cars, trucks, and SUVs. The 25-foot coil provides sufficient length for most full-line replacement runs and is compatible with standard inverted flare brake fittings.