Raybestos 980155FZN Element3 Rust Prevention Technology Coated Rear Disc Brake Rotors use a propriety finishing technology to coat each rotor's entire surface, including the cooling vanes, to ensure optimal airflow and cooling. The full Grey Fusion 4.0 coating helps resist corrosion and significantly delays rust-induced performance issues. Three years of field testing prove these rotors stand up to rain, salt and snow for optimal breaking performance and the non-directional ground finish gives you a product that is ready to install right out of the box.