Floating brake disc with a radical, profiled contour brake rotor ring Brake disc design reduces weight and increases brake effect Brake disc center hubs are forged aluminum Rotor construction uses high-friction billet steel Universal left-side or right-side application Select front rotors available with SD-SystemÖ of square-sided buttons that allow the rotor to expand inwards and outwards unrestrained for perfect rotor functionality at any speed or load and increased durability. ROTOR POLISHED MD3091CC