The MotoSport.com Acerbis Vented X-Brake Disc Cover With Mount Kit includes ONE each of the following: Acerbis X-Brake Vented Front Disc Cover: The X-Brake Vented, Acerbis' newest front disc cover, provides unparalleled protection, strength, and design. Features a dual mold-injected design to keep sticks, rocks and other debris from damaging or becoming tangled in the front rotor. Also features ample venting to keep the brake cool in all conditions. The cover also provides protection to the brake caliper. Constructed of durable polypropylene and features a carbon fiber like texture. Acerbis X-Brake Disc Cover Mounting Kit: The Acerbis X-Brake Disc Cover Mounting Kit is a bike-specific mount kit for the Acerbis X-Brake and Spider EVO Covers. It takes place of the O.E.M. spacer and is constructed out of heavy-duty aluminum.