By staggering every other vane, from a full vane to partial vanes, the airflow volume area is dramatically increased. Wilwood SV-GT series directional vane brake rotors use the increased cooling capacity and improved structural stability of the staggered vane design. They are manufactured from premium-grade, long-grain carbon iron for its long wear, high thermal conductivity, and extreme resistance to distortion. Wilwood SV-GT series directional vane brake rotors are fully machined to eliminate stress points and maintain less than .001 in. flatness, parallelism, and runout over the entire rotor. Their unique, asymmetrical face groove pattern provides smoother engagement through reduced harmonics and even pad wear from improved thermal balanced rotor faces. The Wilwood SV-GT series directional vane brake rotors are individually spin-balanced to ensure vibration-free performance at all speeds.