This EBC Pro-Lite Contour Front Brake Rotor is made from high-friction billet steel Pro-Lite Contour Rotors feature aluminum center hubs and sturdy riveted construction The SD-System of square-sided buttons allow the rotor to expand inward and outward EBC Pro-Lite Contour Front Brake Rotors feature a universal left- or right-side application; Notes: GSX-R 1000 '01-02 require 2. BMW models include the rotor ring only. Ducati 848 models include the rotor ring only