The MotoSport.com Acerbis X-Future Front Disc Cover With Mount includes ONE Acerbis X-Future Front Disc Cover and ONE Acerbis X-Brake Disc Cover Mounting Kit, each with the following features: Acerbis X-Future Front Disc Cover: Extended cover for maximum protection of the disc and the brake caliper to protect them from mud, stones and debris. Designed for the best resistance to impacts. Air intakes designed to ensure airflow to the braking system. Easy and intuitive assembly. Maximum diameter of the disc: 280 mm. Light and resistant. 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. Notes: Only fits stock hubs.